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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)
(2*x)/(x-3) = 4-(6/(x-3)) // - 4-(6/(x-3))
(2*x)/(x-3)+6/(x-3)-4 = 0
(2*x)/(x-3)+6/(x-3)+(-4*(x-3))/(x-3) = 0
2*x-4*(x-3)+6 = 0
2*x-4*x+6+12 = 0
18-2*x = 0
(18-2*x)/(x-3) = 0
(18-2*x)/(x-3) = 0 // * x-3
18-2*x = 0
18-2*x = 0 // - 18
-2*x = -18 // : -2
x = -18/(-2)
x = 9
x = 9
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