X=-20+2y

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Solution for X=-20+2y equation: 



X=-20+2X

We move all terms to the left:

X-(-20+2X)=0

We add all the numbers together, and all the variables

X-(2X-20)=0

We get rid of parentheses

X-2X+20=0

We add all the numbers together, and all the variables

-1X+20=0

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

-X=-20

X=-20/-1

X=+20

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