X+x+3x-x=8

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Solution for X+x+3x-x=8 equation: 



X+X+3X-X=8

We move all terms to the left:

X+X+3X-X-(8)=0

We add all the numbers together, and all the variables

4X-8=0

We move all terms containing X to the left, all other terms to the right

4X=8

X=8/4

X=2

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