X=28-7y

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Solution for X=28-7y equation: 



X=28-7X

We move all terms to the left:

X-(28-7X)=0

We add all the numbers together, and all the variables

X-(-7X+28)=0

We get rid of parentheses

X+7X-28=0

We add all the numbers together, and all the variables

8X-28=0

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

8X=28

X=28/8

X=3+1/2

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