X-10y=21

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Solution for X-10y=21 equation: 



X-10X=21

We move all terms to the left:

X-10X-(21)=0

We add all the numbers together, and all the variables

-9X-21=0

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

-9X=21

X=21/-9

X=-2+1/3

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