X=40-3y

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Solution for X=40-3y equation: 



X=40-3X

We move all terms to the left:

X-(40-3X)=0

We add all the numbers together, and all the variables

X-(-3X+40)=0

We get rid of parentheses

X+3X-40=0

We add all the numbers together, and all the variables

4X-40=0

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

4X=40

X=40/4

X=10

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