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3x-13=-7x+15
We move all terms to the left:
3x-13-(-7x+15)=0
We get rid of parentheses
3x+7x-15-13=0
We add all the numbers together, and all the variables
10x-28=0
We move all terms containing x to the left, all other terms to the right
10x=28
x=28/10
x=2+4/5
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