21=1+5m

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Solution for 21=1+5m equation: 



21=1+5m

We move all terms to the left:

21-(1+5m)=0

We add all the numbers together, and all the variables

-(5m+1)+21=0

We get rid of parentheses

-5m-1+21=0

We add all the numbers together, and all the variables

-5m+20=0

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

-5m=-20

m=-20/-5

m=+4

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