X=-20+3y

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Solution for X=-20+3y equation: 



X=-20+3X

We move all terms to the left:

X-(-20+3X)=0

We add all the numbers together, and all the variables

X-(3X-20)=0

We get rid of parentheses

X-3X+20=0

We add all the numbers together, and all the variables

-2X+20=0

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

-2X=-20

X=-20/-2

X=+10

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