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

Answer 1

To solve the equation −3x−9=−21, we need to isolate x on one side of the equation.

First, we can start by adding 9 to both sides of the equation:
-3x - 9 + 9 = -21 + 9
This simplifies to:
-3x = -12

Next, we divide both sides of the equation by -3 to solve for x:
-3x / -3 = -12 / -3
This simplifies to:
x = 4

So the correct number to complete the solution is 4.