18m+6m-21m=15

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Solution for 18m+6m-21m=15 equation: 



18m+6m-21m=15

We move all terms to the left:

18m+6m-21m-(15)=0

We add all the numbers together, and all the variables

3m-15=0

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

3m=15

m=15/3

m=5

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