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120=5x+40
We move all terms to the left:
120-(5x+40)=0
We get rid of parentheses
-5x-40+120=0
We add all the numbers together, and all the variables
-5x+80=0
We move all terms containing x to the left, all other terms to the right
-5x=-80
x=-80/-5
x=+16
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