-3=-20+m

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Solution for -3=-20+m equation: 



-3=-20+m

We move all terms to the left:

-3-(-20+m)=0

We add all the numbers together, and all the variables

-(m-20)-3=0

We get rid of parentheses

-m+20-3=0

We add all the numbers together, and all the variables

-1m+17=0

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

-m=-17

m=-17/-1

m=+17

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