3(2m+1)=21

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Solution for 3(2m+1)=21 equation: 



3(2m+1)=21

We move all terms to the left:

3(2m+1)-(21)=0

We multiply parentheses

6m+3-21=0

We add all the numbers together, and all the variables

6m-18=0

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

6m=18

m=18/6

m=3

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