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

Answer 1

Starting with the equation -3x - 9 = -21, we can solve for x as follows:

-3x - 9 = -21

Adding 9 to both sides of the equation:

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

Simplifying the left side:

-3x = -12

Now, we can isolate x by dividing both sides of the equation by -3:

(-3x)/-3 = (-12)/-3

Simplifying:

x = 4

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