3(2m+3)=21

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Solution for 3(2m+3)=21 equation: 



3(2m+3)=21

We move all terms to the left:

3(2m+3)-(21)=0

We multiply parentheses

6m+9-21=0

We add all the numbers together, and all the variables

6m-12=0

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

6m=12

m=12/6

m=2

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