21-4m=4m+21

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



21-4m=4m+21

We move all terms to the left:

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

We get rid of parentheses

-4m-4m-21+21=0

We add all the numbers together, and all the variables

-8m=0

m=0/-8

m=0

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