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D( X )
4*X-1 = 0
12*X-3 = 0
4*X-1 = 0
4*X-1 = 0
4*X-1 = 0 // + 1
4*X = 1 // : 4
X = 1/4
12*X-3 = 0
12*X-3 = 0
12*X-3 = 0 // + 3
12*X = 3 // : 12
X = 3/12
X = 1/4
X in (-oo:1/4) U (1/4:+oo)
1/(4*X-1) = 3/(12*X-3) // - 3/(12*X-3)
1/(4*X-1)-(3/(12*X-3)) = 0
1/(4*X-1)-3*(12*X-3)^-1 = 0
1/(4*X-1)-3/(12*X-3) = 0
(1*(12*X-3))/((4*X-1)*(12*X-3))+(-3*(4*X-1))/((4*X-1)*(12*X-3)) = 0
1*(12*X-3)-3*(4*X-1) = 0
0 = 0
0/((4*X-1)*(12*X-3)) = 0
0/((4*X-1)*(12*X-3)) = 0 // * (4*X-1)*(12*X-3)
0 = 0
X belongs to the empty set
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