Question 711239
I assume you are just trying to simplify this and there is no equality involved... correct me if I am wrong.
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{{{3a+4b-(-6a-3b)}}}
This minus sign in front of the parenthesis really means that -1 is multiplying what is inside the parens. In other words, it can be re-written as:
{{{3a+4b+(-1)(-6a-3b)}}}
Distribute that -1 multiplier:
{{{3a+4b+6a+3b}}}
Combine like terms and you are done:
{{{highlight(9a+7b)}}}
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Good Luck,
tutor_paul@yahoo.com