X-2y=90

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Solution for X-2y=90 equation: 



X-2X=90

We move all terms to the left:

X-2X-(90)=0

We add all the numbers together, and all the variables

-1X-90=0

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

-X=90

X=90/-1

X=-90

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