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8x=-7x-120
We move all terms to the left:
8x-(-7x-120)=0
We get rid of parentheses
8x+7x+120=0
We add all the numbers together, and all the variables
15x+120=0
We move all terms containing x to the left, all other terms to the right
15x=-120
x=-120/15
x=-8
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