X=20+y.X=2y+13

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Solution for X=20+y.X=2y+13 equation: 



X=20+X.X=2X+13

We move all terms to the left:

X-(20+X.X)=0

We add all the numbers together, and all the variables

X-(X.X+20)=0

We get rid of parentheses

X-X.X-20=0

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

X-X.X=20

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