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D( x )
3*x-4 = 0
3*x-4 = 0
3*x-4 = 0
3*x-4 = 0 // + 4
3*x = 4 // : 3
x = 4/3
x in (-oo:4/3) U (4/3:+oo)
18/(3*x-4) = 3 // - 3
18/(3*x-4)-3 = 0
18/(3*x-4)+(-3*(3*x-4))/(3*x-4) = 0
18-3*(3*x-4) = 0
30-9*x = 0
(30-9*x)/(3*x-4) = 0
(30-9*x)/(3*x-4) = 0 // * 3*x-4
30-9*x = 0
30-9*x = 0 // - 30
-9*x = -30 // : -9
x = -30/(-9)
x = 10/3
x = 10/3
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