-40=-20+m

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Solution for -40=-20+m equation: 



-40=-20+m

We move all terms to the left:

-40-(-20+m)=0

We add all the numbers together, and all the variables

-(m-20)-40=0

We get rid of parentheses

-m+20-40=0

We add all the numbers together, and all the variables

-1m-20=0

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

-m=20

m=20/-1

m=-20

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