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a+5=-8+7a-7+8
We move all terms to the left:
a+5-(-8+7a-7+8)=0
We add all the numbers together, and all the variables
a-(7a-7)+5=0
We get rid of parentheses
a-7a+7+5=0
We add all the numbers together, and all the variables
-6a+12=0
We move all terms containing a to the left, all other terms to the right
-6a=-12
a=-12/-6
a=+2
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