x(x-3) – 4 = 0
x² - 3x – 4 = 0
(x-4)(x+1)=0
x=4 or x =-1

Denominators
Factorise denominators and write with LCD or multiply by LCD to remove denominators.

Here each term was multiplied by the LCD which is x.

Squares
Isolate the SQUARE and take the positive and negative square root on both sides.