Presumably it is equal to zero and you want to know the value(s) of x...
Factors are (3x + 6)(x - 3) making x either -2 or 3.
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The given expression can be simplified to: 3X squared +27
3x squared - (3x) squared = 0
(12x2 + 18) / (3x2 + 6) = (4x2 + 6) / (x2 + 2)
That factors to (x - 3)(x + 6)
5x2 + 3x + 8x2 = 13x2 + 3x = x(13x + 3)