diff --git a/pymath/calculus/abstract_polynom.py b/pymath/calculus/abstract_polynom.py
index 020836f..0859ff1 100644
--- a/pymath/calculus/abstract_polynom.py
+++ b/pymath/calculus/abstract_polynom.py
@@ -417,8 +417,7 @@ class AbstractPolynom(Explicable):
             smpl_elem.append(smpl_c)
 
         pstfx_add = postfix_op(
-                smpl_elem,
-                #[i for i in smpl_elem if i != 0],
+                [i for i in smpl_elem if i != 0],
                 op.add
                 )