X+-3y=-21

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Solution for X+-3y=-21 equation: 



X+-3X=-21

We move all terms to the left:

X+-3X-(-21)=0

We add all the numbers together, and all the variables

-2X+21=0

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

-2X=-21

X=-21/-2

X=10+1/2

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