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(3x-15)+(8x-40)=22
We move all terms to the left:
(3x-15)+(8x-40)-(22)=0
We get rid of parentheses
3x+8x-15-40-22=0
We add all the numbers together, and all the variables
11x-77=0
We move all terms containing x to the left, all other terms to the right
11x=77
x=77/11
x=7
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