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4a+8=a-4
We move all terms to the left:
4a+8-(a-4)=0
We get rid of parentheses
4a-a+4+8=0
We add all the numbers together, and all the variables
3a+12=0
We move all terms containing a to the left, all other terms to the right
3a=-12
a=-12/3
a=-4
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