9-4(2+m)=21

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Solution for 9-4(2+m)=21 equation: 



9-4(2+m)=21

We move all terms to the left:

9-4(2+m)-(21)=0

We add all the numbers together, and all the variables

-4(m+2)+9-21=0

We add all the numbers together, and all the variables

-4(m+2)-12=0

We multiply parentheses

-4m-8-12=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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