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-2(a+6)=-28
We move all terms to the left:
-2(a+6)-(-28)=0
We add all the numbers together, and all the variables
-2(a+6)+28=0
We multiply parentheses
-2a-12+28=0
We add all the numbers together, and all the variables
-2a+16=0
We move all terms containing a to the left, all other terms to the right
-2a=-16
a=-16/-2
a=+8
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