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7a+7a=-2(-a-4)+2(8a+2)
We move all terms to the left:
7a+7a-(-2(-a-4)+2(8a+2))=0
We add all the numbers together, and all the variables
7a+7a-(-2(-1a-4)+2(8a+2))=0
We add all the numbers together, and all the variables
14a-(-2(-1a-4)+2(8a+2))=0
We calculate terms in parentheses: -(-2(-1a-4)+2(8a+2)), so:We get rid of parentheses
-2(-1a-4)+2(8a+2)
We multiply parentheses
2a+16a+8+4
We add all the numbers together, and all the variables
18a+12
Back to the equation:
-(18a+12)
14a-18a-12=0
We add all the numbers together, and all the variables
-4a-12=0
We move all terms containing a to the left, all other terms to the right
-4a=12
a=12/-4
a=-3
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