X=31-7y

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Solution for X=31-7y equation: 



X=31-7X

We move all terms to the left:

X-(31-7X)=0

We add all the numbers together, and all the variables

X-(-7X+31)=0

We get rid of parentheses

X+7X-31=0

We add all the numbers together, and all the variables

8X-31=0

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

8X=31

X=31/8

X=3+7/8

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