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11x-89=31+3x
We move all terms to the left:
11x-89-(31+3x)=0
We add all the numbers together, and all the variables
11x-(3x+31)-89=0
We get rid of parentheses
11x-3x-31-89=0
We add all the numbers together, and all the variables
8x-120=0
We move all terms containing x to the left, all other terms to the right
8x=120
x=120/8
x=15
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