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x^4-9x^2 x^2(x^2-9) x^2-9
x^2+6x+9 (x+3)^2 (x+3)^2 x+3 x+3
---------------- = ---------------= -------------------- =----------------- =----------------
3x^2-27 3(x^2-9) 3(x-3)(x+3) 3(x-3) 3x-9