Answer: The answer is -3.
Explanation:
To solve the equation 4x - 9 = -21, we can follow these steps:
Step 1: Move the constant term to the other side of the equation:
4x - 9 + 9 = -21 + 9
Simplifying, we have:
4x = -12
Step 2: Divide both sides of the equation by the coefficient of x (4 in this case) to isolate x:
4x/4 = -12/4
Simplifying further, we get:
x = -3
Therefore, the solution to the equation 4x - 9 = -21 is x = -3.