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(5a-3a)+(8+7a)=0
We add all the numbers together, and all the variables
(+2a)+(7a+8)=0
We get rid of parentheses
2a+7a+8=0
We add all the numbers together, and all the variables
9a+8=0
We move all terms containing a to the left, all other terms to the right
9a=-8
a=-8/9
a=-8/9
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