lib/dydx/helper.rb in dydx-0.1.28 vs lib/dydx/helper.rb in dydx-0.1.29

@@ -60,10 +60,11 @@
 
     def combinable?(x, operator)
       case operator
       when :+
         (is_num? && x.is_num?) ||
+        (formula?(:*) && (f.is_num? || g.is_num?)) && x.is_num? ||
         like_term?(x) ||
         inverse?(:+, x)
       when :*
         self == x ||
         (is_num? && x.is_num?) ||
@@ -106,12 +107,9 @@
       end
     end
 
     def rest(f_or_g)
       ([:f, :g] - [f_or_g]).first
-    end
-
-    def commutative?
     end
 
     def distributable?(operator)
     end