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X+2X=350-50
We move all terms to the left:
X+2X-(350-50)=0
We add all the numbers together, and all the variables
X+2X-300=0
We add all the numbers together, and all the variables
3X-300=0
We move all terms containing X to the left, all other terms to the right
3X=300
X=300/3
X=100
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