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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)
2/x-(1/(x-3)) = 0
2/x-(x-3)^-1 = 0
2/x-1/(x-3) = 0
(-1*x)/(x*(x-3))+(2*(x-3))/(x*(x-3)) = 0
2*(x-3)-1*x = 0
x-6 = 0
(x-6)/(x*(x-3)) = 0
(x-6)/(x*(x-3)) = 0 // * x*(x-3)
x-6 = 0
x-6 = 0 // + 6
x = 6
x = 6
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