(6x + 9 +2x(x-3) - x^2 - 3x - 9) / ((x - 3)(x^2 + 3x + 9)) = 0
(2x^2 - 6x + 6x + 9 - 9 - x^2 - 3x) / ((x - 3)(x^2 + 3x + 9)) = 0
(x(x - 3)) / / ((x - 3)(x^2 + 3x + 9)) = 0 ;
x \neq 3
x(x - 3) = 0
x = 0; " alt="1 / (x - 3) = 2x / (x^2 + 3x + 9) + (6x + 9) / (x^3 - 27)
(6x + 9 +2x(x-3) - x^2 - 3x - 9) / ((x - 3)(x^2 + 3x + 9)) = 0
(2x^2 - 6x + 6x + 9 - 9 - x^2 - 3x) / ((x - 3)(x^2 + 3x + 9)) = 0
(x(x - 3)) / / ((x - 3)(x^2 + 3x + 9)) = 0 ;
x \neq 3
x(x - 3) = 0
x = 0; " align="absmiddle" class="latex-formula">