X=100-3y

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Solution for X=100-3y equation: 



X=100-3X

We move all terms to the left:

X-(100-3X)=0

We add all the numbers together, and all the variables

X-(-3X+100)=0

We get rid of parentheses

X+3X-100=0

We add all the numbers together, and all the variables

4X-100=0

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

4X=100

X=100/4

X=25

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