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D( x )
x = 0
x-3 = 0
x = 0
x = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:0) U (0:3) U (3:+oo)
8/x = 22/(x-3) // - 22/(x-3)
8/x-(22/(x-3)) = 0
8/x-22*(x-3)^-1 = 0
8/x-22/(x-3) = 0
(-22*x)/(x*(x-3))+(8*(x-3))/(x*(x-3)) = 0
8*(x-3)-22*x = 0
-14*x-24 = 0
(-14*x-24)/(x*(x-3)) = 0
(-14*x-24)/(x*(x-3)) = 0 // * x*(x-3)
-14*x-24 = 0
-14*x-24 = 0 // + 24
-14*x = 24 // : -14
x = 24/(-14)
x = -12/7
x = -12/7
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