To solve the equation 4x + 9 = 21, you need to isolate x on one side of the equation.
First, subtract 9 from both sides of the equation: 4x + 9 - 9 = 21 - 9
This simplifies to: 4x = 12
Next, divide both sides of the equation by 4 to solve for x: (4x)/4 = 12/4
This simplifies to: x = 3
Therefore, the solution to the equation 4x + 9 = 21 is x = 3.
4x+9=21
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