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8=-2a-6a
We move all terms to the left:
8-(-2a-6a)=0
We add all the numbers together, and all the variables
-(-8a)+8=0
We get rid of parentheses
8a+8=0
We move all terms containing a to the left, all other terms to the right
8a=-8
a=-8/8
a=-1
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