X=18-7y

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Solution for X=18-7y equation: 



X=18-7X

We move all terms to the left:

X-(18-7X)=0

We add all the numbers together, and all the variables

X-(-7X+18)=0

We get rid of parentheses

X+7X-18=0

We add all the numbers together, and all the variables

8X-18=0

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

8X=18

X=18/8

X=2+1/4

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