The equation - 3x - 9 = - 21 is solved as follows. Supply the correct numbers to complete the solution (1 point)

Question

- 3x - 9 = - 21

- 3x = Add 9 to both sides

x = Divide both sides by -3.

Answer 1

- 3x - 9 = - 21

- 3x = -21 + 9 (Add 9 to both sides)

- 3x = -12

x = -12 / -3 (Divide both sides by -3)

x = 4