x+20y=-18

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Solution for x+20y=-18 equation: 



X+20X=-18

We move all terms to the left:

X+20X-(-18)=0

We add all the numbers together, and all the variables

21X+18=0

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

21X=-18

X=-18/21

X=-6/7

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