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8=-8+4a
We move all terms to the left:
8-(-8+4a)=0
We add all the numbers together, and all the variables
-(4a-8)+8=0
We get rid of parentheses
-4a+8+8=0
We add all the numbers together, and all the variables
-4a+16=0
We move all terms containing a to the left, all other terms to the right
-4a=-16
a=-16/-4
a=+4
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