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5x+15=-2x+8
We move all terms to the left:
5x+15-(-2x+8)=0
We get rid of parentheses
5x+2x-8+15=0
We add all the numbers together, and all the variables
7x+7=0
We move all terms containing x to the left, all other terms to the right
7x=-7
x=-7/7
x=-1
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