X+9y=40

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Solution for X+9y=40 equation: 



X+9X=40

We move all terms to the left:

X+9X-(40)=0

We add all the numbers together, and all the variables

10X-40=0

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

10X=40

X=40/10

X=4

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