Question 78815
{{{9y-(-4y-2x)}}}
The tricky part here is to recognize the implications of that minus sign in front of the parenthesis. Think of it as a -1 multiplying everything inside the parenthesis, like this:
{{{9y+(-1)(-4y-2x)}}}
Now, when you "remove" the parenthesis, you can see that you are really multiplying through by -1:
{{{9y+4y+2x}}}
Now, you can combine "like" terms for the final answer:
{{{highlight(13y+2x)}}}
Good Luck,
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