6m-7+8m=21

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Solution for 6m-7+8m=21 equation: 



6m-7+8m=21

We move all terms to the left:

6m-7+8m-(21)=0

We add all the numbers together, and all the variables

14m-28=0

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

14m=28

m=28/14

m=2

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