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6x-77=4x-15
We move all terms to the left:
6x-77-(4x-15)=0
We get rid of parentheses
6x-4x+15-77=0
We add all the numbers together, and all the variables
2x-62=0
We move all terms containing x to the left, all other terms to the right
2x=62
x=62/2
x=31
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