Respuesta :

rococo908

Answer:

-5

Step-by-step explanation:

Add 21 to both sides:

-3m - 21 = -6

-3m = 15

Divide each side by -3

m = -5

Rikzahkhattal

Answer:

-5

Step-by-step explanation:

-3m-21=-6

switch sides to remove the negative sign

6-21=3m

-15=3m

-15/3=m

m=-5

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