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D( x )
1-(4*x) = 0
3*x-1 = 0
1-(4*x) = 0
1-(4*x) = 0
1-4*x = 0
1-4*x = 0 // - 1
-4*x = -1 // : -4
x = -1/(-4)
x = 1/4
3*x-1 = 0
3*x-1 = 0
3*x-1 = 0 // + 1
3*x = 1 // : 3
x = 1/3
x in (-oo:1/4) U (1/4:1/3) U (1/3:+oo)
3/(3*x-1) = 2/(1-(4*x)) // - 2/(1-(4*x))
3/(3*x-1)-(2/(1-(4*x))) = 0
3/(3*x-1)-2*(1-4*x)^-1 = 0
3/(3*x-1)-2/(1-4*x) = 0
(3*(1-4*x))/((3*x-1)*(1-4*x))+(-2*(3*x-1))/((3*x-1)*(1-4*x)) = 0
3*(1-4*x)-2*(3*x-1) = 0
5-18*x = 0
(5-18*x)/((3*x-1)*(1-4*x)) = 0
(5-18*x)/((3*x-1)*(1-4*x)) = 0 // * (3*x-1)*(1-4*x)
5-18*x = 0
5-18*x = 0 // - 5
-18*x = -5 // : -18
x = -5/(-18)
x = 5/18
x = 5/18
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