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5x+7=-3x-8
We move all terms to the left:
5x+7-(-3x-8)=0
We get rid of parentheses
5x+3x+8+7=0
We add all the numbers together, and all the variables
8x+15=0
We move all terms containing x to the left, all other terms to the right
8x=-15
x=-15/8
x=-1+7/8
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