-21=-6m+4+m

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Solution for -21=-6m+4+m equation: 



-21=-6m+4+m

We move all terms to the left:

-21-(-6m+4+m)=0

We add all the numbers together, and all the variables

-(-5m+4)-21=0

We get rid of parentheses

5m-4-21=0

We add all the numbers together, and all the variables

5m-25=0

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

5m=25

m=25/5

m=5

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