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150-2x=120+2x
We move all terms to the left:
150-2x-(120+2x)=0
We add all the numbers together, and all the variables
-2x-(2x+120)+150=0
We get rid of parentheses
-2x-2x-120+150=0
We add all the numbers together, and all the variables
-4x+30=0
We move all terms containing x to the left, all other terms to the right
-4x=-30
x=-30/-4
x=7+1/2
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