5=21-4m

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Solution for 5=21-4m equation: 



5=21-4m

We move all terms to the left:

5-(21-4m)=0

We add all the numbers together, and all the variables

-(-4m+21)+5=0

We get rid of parentheses

4m-21+5=0

We add all the numbers together, and all the variables

4m-16=0

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

4m=16

m=16/4

m=4

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