21+6=3*m

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Solution for 21+6=3*m equation: 



21+6=3m

We move all terms to the left:

21+6-(3m)=0

We add all the numbers together, and all the variables

-3m+27=0

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

-3m=-27

m=-27/-3

m=+9

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