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-2(a+17)=12
We move all terms to the left:
-2(a+17)-(12)=0
We multiply parentheses
-2a-34-12=0
We add all the numbers together, and all the variables
-2a-46=0
We move all terms containing a to the left, all other terms to the right
-2a=46
a=46/-2
a=-23
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