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D( x )
4*x-1 = 0
4*x-1 = 0
4*x-1 = 0
4*x-1 = 0 // + 1
4*x = 1 // : 4
x = 1/4
x in (-oo:1/4) U (1/4:+oo)
1/(4*x-1) = 5 // - 5
1/(4*x-1)-5 = 0
1/(4*x-1)+(-5*(4*x-1))/(4*x-1) = 0
1-5*(4*x-1) = 0
6-20*x = 0
(6-20*x)/(4*x-1) = 0
(6-20*x)/(4*x-1) = 0 // * 4*x-1
6-20*x = 0
6-20*x = 0 // - 6
-20*x = -6 // : -20
x = -6/(-20)
x = 3/10
x = 3/10
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