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6(a-1)=-102
We move all terms to the left:
6(a-1)-(-102)=0
We add all the numbers together, and all the variables
6(a-1)+102=0
We multiply parentheses
6a-6+102=0
We add all the numbers together, and all the variables
6a+96=0
We move all terms containing a to the left, all other terms to the right
6a=-96
a=-96/6
a=-16
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