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150-x-2x=+120+2x
We move all terms to the left:
150-x-2x-(+120+2x)=0
We add all the numbers together, and all the variables
-x-2x-(2x+120)+150=0
We add all the numbers together, and all the variables
-3x-(2x+120)+150=0
We get rid of parentheses
-3x-2x-120+150=0
We add all the numbers together, and all the variables
-5x+30=0
We move all terms containing x to the left, all other terms to the right
-5x=-30
x=-30/-5
x=+6
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