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4+8a=6a-8
We move all terms to the left:
4+8a-(6a-8)=0
We get rid of parentheses
8a-6a+8+4=0
We add all the numbers together, and all the variables
2a+12=0
We move all terms containing a to the left, all other terms to the right
2a=-12
a=-12/2
a=-6
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