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8x-(2x-23)=77
We move all terms to the left:
8x-(2x-23)-(77)=0
We get rid of parentheses
8x-2x+23-77=0
We add all the numbers together, and all the variables
6x-54=0
We move all terms containing x to the left, all other terms to the right
6x=54
x=54/6
x=9
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