3+4.5m=21

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Solution for 3+4.5m=21 equation: 



3+4.5m=21

We move all terms to the left:

3+4.5m-(21)=0

We add all the numbers together, and all the variables

4.5m-18=0

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

4.5m=18

m=18/4.5

m=4

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