2m+18=m+21

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Solution for 2m+18=m+21 equation: 



2m+18=m+21

We move all terms to the left:

2m+18-(m+21)=0

We get rid of parentheses

2m-m-21+18=0

We add all the numbers together, and all the variables

m-3=0

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

m=3

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