-X+3y=100

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Solution for -X+3y=100 equation: 



-X+3X=100

We move all terms to the left:

-X+3X-(100)=0

We add all the numbers together, and all the variables

2X-100=0

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

2X=100

X=100/2

X=50

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