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-(3a+2)-3(5a+7=)
We move all terms to the left:
-(3a+2)-3(5a+7-())=0
We get rid of parentheses
-3a-3(5a+7-())-2=0
We move all terms containing a to the left, all other terms to the right
-3a-3(5a+7-())=2
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