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D( x )
x+2 = 0
x = 0
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x = 0
x = 0
x in (-oo:-2) U (-2:0) U (0:+oo)
(9*x-y)/(x+2)+15/x = 9 // - 9
(9*x-y)/(x+2)+15/x-9 = 0
(x*(9*x-y))/(x*(x+2))+(15*(x+2))/(x*(x+2))+(-9*x*(x+2))/(x*(x+2)) = 0
x*(9*x-y)+15*(x+2)-9*x*(x+2) = 0
9*x^2-9*x^2+15*x-18*x-(x*y)+30 = 0
30-3*x-(x*y) = 0
30-3*x-(x*y) = 0
30-3*x = 0 // - 30
-3*x = -30 // : -3
x = -30/(-3)
x = 10
x-10 = 0
(x-10)/(x*(x+2)) = 0
(x-10)/(x*(x+2)) = 0 // * x*(x+2)
x-10 = 0
x-10 = 0 // + 10
x = 10
x = 10
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