(X+6)(x-3)-(x+3)(x+9)=9

Question

(X+6)(x-3)-(x+3)(x+9)=9

Answer 1

(X+6)(x-3)-(x+3)(x+9)=9

x² - 3x + 6x - 18 - x² - 12x - 27 = 9

-9x - 45 = 9

-9x = 9 + 45

-9x = 54

x = -54 : 9

x = -6