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5x+8=-7x
We move all terms to the left:
5x+8-(-7x)=0
We get rid of parentheses
5x+7x+8=0
We add all the numbers together, and all the variables
12x+8=0
We move all terms containing x to the left, all other terms to the right
12x=-8
x=-8/12
x=-2/3
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