X=15+7y

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Solution for X=15+7y equation: 



X=15+7X

We move all terms to the left:

X-(15+7X)=0

We add all the numbers together, and all the variables

X-(7X+15)=0

We get rid of parentheses

X-7X-15=0

We add all the numbers together, and all the variables

-6X-15=0

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

-6X=15

X=15/-6

X=-2+1/2

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