-21=-1+4m

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Solution for -21=-1+4m equation: 



-21=-1+4m

We move all terms to the left:

-21-(-1+4m)=0

We add all the numbers together, and all the variables

-(4m-1)-21=0

We get rid of parentheses

-4m+1-21=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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