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$\frac{a^2 + a - 3ab - 3b}{(a + 1)(3b^2 - ab)}$
$=\frac{(a + 1)(a - 3b)}{(a + 1)b(3b-a)}$
$=\frac{a - 3b}{-b(a - 3b)}$
$=\frac{-1}{b}$
raphael answered the question on December 16, 2016 at 12:35