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120=2x+8
We move all terms to the left:
120-(2x+8)=0
We get rid of parentheses
-2x-8+120=0
We add all the numbers together, and all the variables
-2x+112=0
We move all terms containing x to the left, all other terms to the right
-2x=-112
x=-112/-2
x=+56
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