21=5m+7

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Solution for 21=5m+7 equation: 



21=5m+7

We move all terms to the left:

21-(5m+7)=0

We get rid of parentheses

-5m-7+21=0

We add all the numbers together, and all the variables

-5m+14=0

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

-5m=-14

m=-14/-5

m=2+4/5

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