X+2x+7x+1=31

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Solution for X+2x+7x+1=31 equation: 



X+2X+7X+1=31

We move all terms to the left:

X+2X+7X+1-(31)=0

We add all the numbers together, and all the variables

10X-30=0

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

10X=30

X=30/10

X=3

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