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120=6x+30
We move all terms to the left:
120-(6x+30)=0
We get rid of parentheses
-6x-30+120=0
We add all the numbers together, and all the variables
-6x+90=0
We move all terms containing x to the left, all other terms to the right
-6x=-90
x=-90/-6
x=+15
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