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6a+7(6)=a-2
We move all terms to the left:
6a+7(6)-(a-2)=0
We get rid of parentheses
6a-a+2+76=0
We add all the numbers together, and all the variables
5a+78=0
We move all terms containing a to the left, all other terms to the right
5a=-78
a=-78/5
a=-15+3/5
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