(36-x^2)/(x+6)^2 / (x-3) / ( x^2+3x-18)
(36 - x^2 ) / (x+6)^2 x (x-3) / (x+6)(x-3)
(6-x)(6+x) / (x+6)(x+6) x 1 /(x+6)
(6-x)/(x+6) x 1 / (x+6)
(x+6) cancels out
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