8m-5m=21+15

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Solution for 8m-5m=21+15 equation: 



8m-5m=21+15

We move all terms to the left:

8m-5m-(21+15)=0

We add all the numbers together, and all the variables

8m-5m-36=0

We add all the numbers together, and all the variables

3m-36=0

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

3m=36

m=36/3

m=12

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