X-9=-15+7z

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Solution for X-9=-15+7z equation: 



X-9=-15+7X

We move all terms to the left:

X-9-(-15+7X)=0

We add all the numbers together, and all the variables

X-(7X-15)-9=0

We get rid of parentheses

X-7X+15-9=0

We add all the numbers together, and all the variables

-6X+6=0

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

-6X=-6

X=-6/-6

X=1

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