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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) = 8 // - 8
(2*x)/(x-3)-8 = 0
(2*x)/(x-3)+(-8*(x-3))/(x-3) = 0
2*x-8*(x-3) = 0
24-6*x = 0
(24-6*x)/(x-3) = 0
(24-6*x)/(x-3) = 0 // * x-3
24-6*x = 0
24-6*x = 0 // - 24
-6*x = -24 // : -6
x = -24/(-6)
x = 4
x = 4
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