x-9=-4y

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Solution for x-9=-4y equation: 



X-9=-4X

We move all terms to the left:

X-9-(-4X)=0

We get rid of parentheses

X+4X-9=0

We add all the numbers together, and all the variables

5X-9=0

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

5X=9

X=9/5

X=1+4/5

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