What is the solution to the equation 3x + 9 = 0?

To find the solution to the equation (3x + 9 = 0), you will isolate the variable (x).

First, start by subtracting 9 from both sides of the equation:

[

3x + 9 - 9 = 0 - 9

]

This simplifies to:

[

3x = -9

]

Next, divide both sides by 3 to solve for (x):

[

x = \frac{-9}{3}

]

This gives:

[

x = -3

]

Therefore, the correct solution is (-3). It satisfies the original equation because if you substitute (-3) back into (3x + 9):

[

3(-3) + 9 = -9 + 9 = 0

]

Thus, it verifies that (-3) is indeed the solution. The other options do not satisfy the equation as shown through the isolating process or by substitution into the original equation.