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D( x )
x-5 = 0
x+3 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x+3 = 0
x+3 = 0
x+3 = 0 // - 3
x = -3
x in (-oo:-3) U (-3:5) U (5:+oo)
9/(x-5) = 8/(x+3) // - 8/(x+3)
9/(x-5)-(8/(x+3)) = 0
9/(x-5)-8*(x+3)^-1 = 0
9/(x-5)-8/(x+3) = 0
(9*(x+3))/((x-5)*(x+3))+(-8*(x-5))/((x-5)*(x+3)) = 0
9*(x+3)-8*(x-5) = 0
x+67 = 0
(x+67)/((x-5)*(x+3)) = 0
(x+67)/((x-5)*(x+3)) = 0 // * (x-5)*(x+3)
x+67 = 0
x+67 = 0 // - 67
x = -67
x = -67
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