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4a+4=-12+8a
We move all terms to the left:
4a+4-(-12+8a)=0
We add all the numbers together, and all the variables
4a-(8a-12)+4=0
We get rid of parentheses
4a-8a+12+4=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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