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r in (-oo:+oo)
r = (6*9)/((1+8)^3) // - (6*9)/((1+8)^3)
r-((6*9)/((1+8)^3)) = 0
r-54*(1+8)^-3 = 0
r-2/27 = 0 // + 2/27
r = 2/27
r = 2/27
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