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X+3X-4X+7X=2-4+5
We move all terms to the left:
X+3X-4X+7X-(2-4+5)=0
We add all the numbers together, and all the variables
X+3X-4X+7X-3=0
We add all the numbers together, and all the variables
7X-3=0
We move all terms containing X to the left, all other terms to the right
7X=3
X=3/7
X=3/7
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