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150-12x=120-0.5x
We move all terms to the left:
150-12x-(120-0.5x)=0
We add all the numbers together, and all the variables
-12x-(-0.5x+120)+150=0
We get rid of parentheses
-12x+0.5x-120+150=0
We add all the numbers together, and all the variables
-11.5x+30=0
We move all terms containing x to the left, all other terms to the right
-11.5x=-30
x=-30/-11.5
x=2+7/11.5
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