8m-15=5m-21

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



8m-15=5m-21

We move all terms to the left:

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

We get rid of parentheses

8m-5m+21-15=0

We add all the numbers together, and all the variables

3m+6=0

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

3m=-6

m=-6/3

m=-2

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