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5a=-3a-64
We move all terms to the left:
5a-(-3a-64)=0
We get rid of parentheses
5a+3a+64=0
We add all the numbers together, and all the variables
8a+64=0
We move all terms containing a to the left, all other terms to the right
8a=-64
a=-64/8
a=-8
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