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8x+13=-7x+3
We move all terms to the left:
8x+13-(-7x+3)=0
We get rid of parentheses
8x+7x-3+13=0
We add all the numbers together, and all the variables
15x+10=0
We move all terms containing x to the left, all other terms to the right
15x=-10
x=-10/15
x=-2/3
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