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7x=8x+120
We move all terms to the left:
7x-(8x+120)=0
We get rid of parentheses
7x-8x-120=0
We add all the numbers together, and all the variables
-1x-120=0
We move all terms containing x to the left, all other terms to the right
-x=120
x=120/-1
x=-120
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