X=12+9y

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Solution for X=12+9y equation: 



X=12+9X

We move all terms to the left:

X-(12+9X)=0

We add all the numbers together, and all the variables

X-(9X+12)=0

We get rid of parentheses

X-9X-12=0

We add all the numbers together, and all the variables

-8X-12=0

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

-8X=12

X=12/-8

X=-1+1/2

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