Respuesta :

Answer:

z = -3

Step-by-step explanation:

3 - 3z = 12

-3z = 12 - 3

-3z = 9

z = 9/-3

z = -9/3

z = -3

Answer:

z = -3

Step-by-step explanation:

3 - 3z = 12

=> - 3z = 12 - 3

=> - 3z = 9

=> z = 9/-3

=> z = -3