3x2 – 27 = 0

To solve for x:

3x^2 - 27 = 0

First, add 27 to both sides:

3x^2 = 27

Then, divide both sides by 3:

x^2 = 9

Take the square root of both sides:

x = ±3

So the solutions are x = 3 and x = -3.