X+x+2x=280

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Solution for X+x+2x=280 equation: 



X+X+2X=280

We move all terms to the left:

X+X+2X-(280)=0

We add all the numbers together, and all the variables

4X-280=0

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

4X=280

X=280/4

X=70

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