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9x-13=-2x+42
We move all terms to the left:
9x-13-(-2x+42)=0
We get rid of parentheses
9x+2x-42-13=0
We add all the numbers together, and all the variables
11x-55=0
We move all terms containing x to the left, all other terms to the right
11x=55
x=55/11
x=5
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