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D( x )
x-3 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:3) U (3:+oo)
1/(x-3) = 2 // - 2
1/(x-3)-2 = 0
1/(x-3)+(-2*(x-3))/(x-3) = 0
1-2*(x-3) = 0
7-2*x = 0
(7-2*x)/(x-3) = 0
(7-2*x)/(x-3) = 0 // * x-3
7-2*x = 0
7-2*x = 0 // - 7
-2*x = -7 // : -2
x = -7/(-2)
x = 7/2
x = 7/2
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