m-3(7-m)=-21

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Solution for m-3(7-m)=-21 equation: 



m-3(7-m)=-21

We move all terms to the left:

m-3(7-m)-(-21)=0

We add all the numbers together, and all the variables

m-3(-1m+7)-(-21)=0

We add all the numbers together, and all the variables

m-3(-1m+7)+21=0

We multiply parentheses

m+3m-21+21=0

We add all the numbers together, and all the variables

4m=0

m=0/4

m=0

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