-3(m-1)=21

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Solution for -3(m-1)=21 equation: 



-3(m-1)=21

We move all terms to the left:

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

We multiply parentheses

-3m+3-21=0

We add all the numbers together, and all the variables

-3m-18=0

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

-3m=18

m=18/-3

m=-6

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