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-2(-3a-8)=1
We move all terms to the left:
-2(-3a-8)-(1)=0
We multiply parentheses
6a+16-1=0
We add all the numbers together, and all the variables
6a+15=0
We move all terms containing a to the left, all other terms to the right
6a=-15
a=-15/6
a=-2+1/2
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