X=-9+2.5y

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Solution for X=-9+2.5y equation: 



X=-9+2.5X

We move all terms to the left:

X-(-9+2.5X)=0

We add all the numbers together, and all the variables

X-(2.5X-9)=0

We get rid of parentheses

X-2.5X+9=0

We add all the numbers together, and all the variables

-1.5X+9=0

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

-1.5X=-9

X=-9/-1.5

X=+6

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