X=13+3y

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Solution for X=13+3y equation: 



X=13+3X

We move all terms to the left:

X-(13+3X)=0

We add all the numbers together, and all the variables

X-(3X+13)=0

We get rid of parentheses

X-3X-13=0

We add all the numbers together, and all the variables

-2X-13=0

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

-2X=13

X=13/-2

X=-6+1/2

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