X=31-2y

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Solution for X=31-2y equation: 



X=31-2X

We move all terms to the left:

X-(31-2X)=0

We add all the numbers together, and all the variables

X-(-2X+31)=0

We get rid of parentheses

X+2X-31=0

We add all the numbers together, and all the variables

3X-31=0

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

3X=31

X=31/3

X=10+1/3

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