SOLUTION: I don't understand this question: Simplify the expression. 4wxy - 8wxy

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Question 270822: I don't understand this question:
Simplify the expression.
4wxy - 8wxy
Answer by JBarnum(2146) About Me  (Show Source):
You can put this solution on YOUR website!
4wxy-8wxy
say for instance wxy=z
then the equation looks like:
4z-8z and we know that 4-8=-4
so then it would be 4z-8z=-4z
and then go back to original problem its
highlight%284wxy-8wxy=-4wxy%29