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2x-13=-5x+8
We move all terms to the left:
2x-13-(-5x+8)=0
We get rid of parentheses
2x+5x-8-13=0
We add all the numbers together, and all the variables
7x-21=0
We move all terms containing x to the left, all other terms to the right
7x=21
x=21/7
x=3
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