diff --git a/pymath/calculus/abstract_polynom.py b/pymath/calculus/abstract_polynom.py
index a582985..020836f 100644
--- a/pymath/calculus/abstract_polynom.py
+++ b/pymath/calculus/abstract_polynom.py
@@ -385,6 +385,8 @@ class AbstractPolynom(Explicable):
 
     def simplify(self):
         """Same as reduce """
+        if isNumber(self._letter):
+            return self.replace_letter(self._letter).simplify()
         return self.reduce()
 
     @classmethod
diff --git a/pymath/calculus/explicable.py b/pymath/calculus/explicable.py
index 006f4a3..6b21569 100644
--- a/pymath/calculus/explicable.py
+++ b/pymath/calculus/explicable.py
@@ -124,7 +124,7 @@ class Explicable(Renderable):
         >>> print(e.steps)
         ['cook', 'eat', 'sleep']
         """
-        self.steps = steps + self.steps
+        self.steps = list(steps) + self.steps
 
     def steal_history(self, arg1):
         """ Steal the history of arg1 for itself