6m+21=3m

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Solution for 6m+21=3m equation: 



6m+21=3m

We move all terms to the left:

6m+21-(3m)=0

We add all the numbers together, and all the variables

3m+21=0

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

3m=-21

m=-21/3

m=-7

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