Question

x+20/x-12=0 factorisation method.

Answer 1

$x + \frac{20}{x} - 12 = 0 \\ {x}^{2} + 20 - 12x = 0 \\ \\ {x}^{2} - 12x + 20 = 0 \\ {x}^{2} - 10x - 2x + 20 = 0 \\ x(x - 10) - 2(x - 10) = 0 \\ (x - 10)(x - 2) \: are \: factors$
hope it will help you.