X+20=-3n

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Solution for X+20=-3n equation: 



X+20=-3X

We move all terms to the left:

X+20-(-3X)=0

We get rid of parentheses

X+3X+20=0

We add all the numbers together, and all the variables

4X+20=0

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

4X=-20

X=-20/4

X=-5

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