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120=3x+6
We move all terms to the left:
120-(3x+6)=0
We get rid of parentheses
-3x-6+120=0
We add all the numbers together, and all the variables
-3x+114=0
We move all terms containing x to the left, all other terms to the right
-3x=-114
x=-114/-3
x=+38
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