Respuesta :
Answer:
The answer is -3
Step-by-step explanation:
1. Distribute -7z + 21 = 42
2. Subtract 42 - 21 = 21
3. -7z = 21
4. Divide 21 / -7 = -3
5. Answer is -3
So first multiply -7 by (Z- 3)
And you get 42= -7z + 21
Then subtract 21 from both sides of the equation and you get 21= -7z
Then divide -7 from both sides of the equation
And finally you get Z= -3
And you get 42= -7z + 21
Then subtract 21 from both sides of the equation and you get 21= -7z
Then divide -7 from both sides of the equation
And finally you get Z= -3
