Question

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

−3x=

Add 9 to both sides of the equation.

Answer 1

To solve the equation \(-3x - 9 = -21\), we start by adding 9 to both sides.

Here’s how the steps look:

\[
-3x - 9 + 9 = -21 + 9
\]

This simplifies to:

\[
-3x = -12
\]

So, the completed equation after adding 9 to both sides is:

\(-3x = -12\)