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D( x )
3*x-1 = 0
3*x-1 = 0
3*x-1 = 0
3*x-1 = 0 // + 1
3*x = 1 // : 3
x = 1/3
x in (-oo:1/3) U (1/3:+oo)
20/(3*x-1) = 4 // - 4
20/(3*x-1)-4 = 0
20/(3*x-1)+(-4*(3*x-1))/(3*x-1) = 0
20-4*(3*x-1) = 0
24-12*x = 0
(24-12*x)/(3*x-1) = 0
(24-12*x)/(3*x-1) = 0 // * 3*x-1
24-12*x = 0
24-12*x = 0 // - 24
-12*x = -24 // : -12
x = -24/(-12)
x = 2
x = 2
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