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120-4x=8x-100
We move all terms to the left:
120-4x-(8x-100)=0
We get rid of parentheses
-4x-8x+100+120=0
We add all the numbers together, and all the variables
-12x+220=0
We move all terms containing x to the left, all other terms to the right
-12x=-220
x=-220/-12
x=18+1/3
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