21=m+5-3m

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Solution for 21=m+5-3m equation: 



21=m+5-3m

We move all terms to the left:

21-(m+5-3m)=0

We add all the numbers together, and all the variables

-(-2m+5)+21=0

We get rid of parentheses

2m-5+21=0

We add all the numbers together, and all the variables

2m+16=0

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

2m=-16

m=-16/2

m=-8

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