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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:0) U (0:2) U (2:+oo)
50/(x-2) = 30/x // - 30/x
50/(x-2)-(30/x) = 0
50/(x-2)-30*x^-1 = 0
50/(x-2)-30/x = 0
(50*x)/(x*(x-2))+(-30*(x-2))/(x*(x-2)) = 0
50*x-30*(x-2) = 0
20*x+60 = 0
(20*x+60)/(x*(x-2)) = 0
(20*x+60)/(x*(x-2)) = 0 // * x*(x-2)
20*x+60 = 0
20*x+60 = 0 // - 60
20*x = -60 // : 20
x = -60/20
x = -3
x = -3
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