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D( x )
x-5 = 0
x = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x = 0
x = 0
x in (-oo:0) U (0:5) U (5:+oo)
12/x = 22/(x-5) // - 22/(x-5)
12/x-(22/(x-5)) = 0
12/x-22*(x-5)^-1 = 0
12/x-22/(x-5) = 0
(-22*x)/(x*(x-5))+(12*(x-5))/(x*(x-5)) = 0
12*(x-5)-22*x = 0
-10*x-60 = 0
(-10*x-60)/(x*(x-5)) = 0
(-10*x-60)/(x*(x-5)) = 0 // * x*(x-5)
-10*x-60 = 0
-10*x-60 = 0 // + 60
-10*x = 60 // : -10
x = 60/(-10)
x = -6
x = -6
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