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X=150-2X
We move all terms to the left:
X-(150-2X)=0
We add all the numbers together, and all the variables
X-(-2X+150)=0
We get rid of parentheses
X+2X-150=0
We add all the numbers together, and all the variables
3X-150=0
We move all terms containing X to the left, all other terms to the right
3X=150
X=150/3
X=50
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