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6a-77=2a-17
We move all terms to the left:
6a-77-(2a-17)=0
We get rid of parentheses
6a-2a+17-77=0
We add all the numbers together, and all the variables
4a-60=0
We move all terms containing a to the left, all other terms to the right
4a=60
a=60/4
a=15
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