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D( x )
x+2 = 0
x-3 = 0
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:-2) U (-2:3) U (3:+oo)
9/(x+2) = 24/(x-3) // - 24/(x-3)
9/(x+2)-(24/(x-3)) = 0
9/(x+2)-24*(x-3)^-1 = 0
9/(x+2)-24/(x-3) = 0
(9*(x-3))/((x+2)*(x-3))+(-24*(x+2))/((x+2)*(x-3)) = 0
9*(x-3)-24*(x+2) = 0
-15*x-75 = 0
(-15*x-75)/((x+2)*(x-3)) = 0
(-15*x-75)/((x+2)*(x-3)) = 0 // * (x+2)*(x-3)
-15*x-75 = 0
-15*x-75 = 0 // + 75
-15*x = 75 // : -15
x = 75/(-15)
x = -5
x = -5
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