X-9=-7y

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Solution for X-9=-7y equation: 



X-9=-7X

We move all terms to the left:

X-9-(-7X)=0

We get rid of parentheses

X+7X-9=0

We add all the numbers together, and all the variables

8X-9=0

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

8X=9

X=9/8

X=1+1/8

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