Question

x(x-15)-3=(x+6)(x-6-18)

Answer 1

x(x-15)-3 = (x+6)(x-6-18)
x² - 15x - 3 = (x+6)(x-24)
x² - 15x - 3 = x² + (-24 + 6)x - (24)(6)
x² - 15x - 3 = x² - 18x - 144
   -15x - 3 = -18x - 144
     18x - 15x = -144 + 3
         3x = -141
           x = -141/3
             x = -47

Saludos! Jeyson(Jmg)