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3(a+7)=-2(8-a)
We move all terms to the left:
3(a+7)-(-2(8-a))=0
We add all the numbers together, and all the variables
3(a+7)-(-2(-1a+8))=0
We multiply parentheses
3a-(-2(-1a+8))+21=0
We calculate terms in parentheses: -(-2(-1a+8)), so:We get rid of parentheses
-2(-1a+8)
We multiply parentheses
2a-16
Back to the equation:
-(2a-16)
3a-2a+16+21=0
We add all the numbers together, and all the variables
a+37=0
We move all terms containing a to the left, all other terms to the right
a=-37
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