X-3y=80

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Solution for X-3y=80 equation: 



X-3X=80

We move all terms to the left:

X-3X-(80)=0

We add all the numbers together, and all the variables

-2X-80=0

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

-2X=80

X=80/-2

X=-40

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