add equation from pymath

opytex/opytex.py

@@ -13,6 +13,7 @@ import math as m
 import random as rd
 from pymath import Expression
 from pymath import Polynom
+from pymath import Equation
 from pymath.calculus.polynomDeg2 import Polynom_deg2
 from pymath import Fraction 
 from pymath import random_str 
@@ -27,6 +28,7 @@ export_dict.update({"Expression":Expression,\
         "Polynom":Polynom,\
         "Polynom_deg2":Polynom_deg2,\
         "Fraction":Fraction,\
+        "Equation":Equation,\
         "random_str": random_str,\
         "random_pythagore":random_pythagore,\
         })