-m=20+3m

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Solution for -m=20+3m equation: 



-m=20+3m

We move all terms to the left:

-m-(20+3m)=0

We add all the numbers together, and all the variables

-m-(3m+20)=0

We add all the numbers together, and all the variables

-1m-(3m+20)=0

We get rid of parentheses

-1m-3m-20=0

We add all the numbers together, and all the variables

-4m-20=0

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

-4m=20

m=20/-4

m=-5

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