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(7a+3)+-a-5)=-16
We move all terms to the left:
(7a+3)+-a-5)-(-16)=0
We add all the numbers together, and all the variables
-1a+(7a+3)=0
We get rid of parentheses
-1a+7a+3=0
We add all the numbers together, and all the variables
6a+3=0
We move all terms containing a to the left, all other terms to the right
6a=-3
a=-3/6
a=-1/2
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