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5x+7=-3x-18
We move all terms to the left:
5x+7-(-3x-18)=0
We get rid of parentheses
5x+3x+18+7=0
We add all the numbers together, and all the variables
8x+25=0
We move all terms containing x to the left, all other terms to the right
8x=-25
x=-25/8
x=-3+1/8
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