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6x-13=-5x+42
We move all terms to the left:
6x-13-(-5x+42)=0
We get rid of parentheses
6x+5x-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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