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6a+7(1-6a)=115
We move all terms to the left:
6a+7(1-6a)-(115)=0
We add all the numbers together, and all the variables
6a+7(-6a+1)-115=0
We multiply parentheses
6a-42a+7-115=0
We add all the numbers together, and all the variables
-36a-108=0
We move all terms containing a to the left, all other terms to the right
-36a=108
a=108/-36
a=-3
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