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 get rid of parentheses

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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