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-2(a+8)-8=-12+2a
We move all terms to the left:
-2(a+8)-8-(-12+2a)=0
We add all the numbers together, and all the variables
-2(a+8)-(2a-12)-8=0
We multiply parentheses
-2a-(2a-12)-16-8=0
We get rid of parentheses
-2a-2a+12-16-8=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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