diff --git a/Klassen.py b/Klassen.py
index 61c39e8..217af53 100644
--- a/Klassen.py
+++ b/Klassen.py
@@ -1,30 +1,105 @@
+from copy import deepcopy
+import math
+
+
 class Groesse:
     def __init__(self, formelsymbol, einheit, konst, wert=None):
         self.formelsymbol = formelsymbol
         self.einheit = einheit
         self.wert = wert
         self.konst = konst
+        self.equals_var = None
+
+    def set(self, wert):
+        self.wert = wert
+
+    def set_equals_var(self, var):
+        self.equals_var = var
 
 
 class Formel:
+    class Solver:
+        def _solve_to_i(self):
+            self.
+            return (a**z) * (b**y) * (c**x) + d * e * f + g
+
+        def _solve_to_a(self):
+            pass
+
+        def _solve_to_b(self):
+            pass
+
+        def _solve_to_c(self):
+            pass
+
+        def _solve_to_d(self):
+            pass
+
+        def _solve_to_e(self):
+            pass
+
+        def _solve_to_f(self):
+            pass
+
+        def _solve_to_g(self):# fehlt
+            pass
+
+        def _solve_to_z(self): # fehlt
+            pass
+
+        def _solve_to_y(self):
+            pass
+
+        def _solve_to_x(self):
+            pass
+
     def __init__(self, name, i, a=Groesse(None, None, True, 0), b=Groesse(None, None, True, 0),
                  c=Groesse(None, None, True, 0), d=Groesse(None, None, True, 0), e=Groesse(None, None, True, 0),
                  f=Groesse(None, None, True, 0), g=Groesse(None, None, True, 0), z=Groesse(None, None, True, 0),
                  y=Groesse(None, None, True, 0), x=Groesse(None, None, True, 0)):
         self.a = a
+        self.a.set_equals_var('a')
         self.b = b
+        self.b.set_equals_var('b')
         self.c = c
+        self.c.set_equals_var('c')
         self.d = d
+        self.d.set_equals_var('d')
         self.e = e
+        self.e.set_equals_var('e')
         self.f = f
+        self.f.set_equals_var('f')
         self.g = g
+        self.g.set_equals_var('g')
         self.z = z
+        self.z.set_equals_var('z')
         self.y = y
+        self.y.set_equals_var('y')
         self.x = x
+        self.x.set_equals_var('x')
         self.name = name
         self.i = i
+        self.i.set_equals_var('i')
         self.liste = []
-        for var in [self.a, self.b, self.c]:
+        for var in [self.a, self.b, self.c, self.d, self.e, self.f, self.g, self.z, self.y, self.x, self.i]:
             if var.konst is False:
                 self.liste.append(var)
 
+    def is_solvable(self, geg, ges):
+        temp_liste = deepcopy(self.liste)
+        for geg_element in geg:
+            for liste_element in temp_liste:
+                # serach for element with fitting formelsymbol and then del it
+                pass
+        if len(temp_liste) == 1 and ges[0] == temp_liste[0]: # has to be changed accordingly
+            return [True, temp_liste[0]]
+        return [False, None]
+
+    def solve(self, ges):
+        pass
+
+    def _solve_to_i(self):
+        pass
+
+
+