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

Answer 1

To solve the equation -3x - 9 = -21, we want to isolate the variable x. We can start by adding 9 to both sides of the equation:

-3x - 9 + 9 = -21 + 9

Simplifying, we have:

-3x = -12

Next, we want to solve for x by dividing both sides of the equation by -3:

-3x / -3 = -12 / -3

Simplifying, we have:

x = 4

Therefore, the correct number to complete the solution is 4.