-3=20X+d

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Solution for -3=20X+d equation: 



-3=20X+X

We move all terms to the left:

-3-(20X+X)=0

We add all the numbers together, and all the variables

-(+21X)-3=0

We get rid of parentheses

-21X-3=0

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

-21X=3

X=3/-21

X=-1/7

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