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-2(1+3a)=56
We move all terms to the left:
-2(1+3a)-(56)=0
We add all the numbers together, and all the variables
-2(3a+1)-56=0
We multiply parentheses
-6a-2-56=0
We add all the numbers together, and all the variables
-6a-58=0
We move all terms containing a to the left, all other terms to the right
-6a=58
a=58/-6
a=-9+2/3
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