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6(-7+7a)=42
We move all terms to the left:
6(-7+7a)-(42)=0
We add all the numbers together, and all the variables
6(7a-7)-42=0
We multiply parentheses
42a-42-42=0
We add all the numbers together, and all the variables
42a-84=0
We move all terms containing a to the left, all other terms to the right
42a=84
a=84/42
a=2
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