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2a-(3+8a)=-6-7a
We move all terms to the left:
2a-(3+8a)-(-6-7a)=0
We add all the numbers together, and all the variables
2a-(8a+3)-(-7a-6)=0
We get rid of parentheses
2a-8a+7a-3+6=0
We add all the numbers together, and all the variables
a+3=0
We move all terms containing a to the left, all other terms to the right
a=-3
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