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D( y )
4*y-1 = 0
4*y-1 = 0
4*y-1 = 0
4*y-1 = 0 // + 1
4*y = 1 // : 4
y = 1/4
y in (-oo:1/4) U (1/4:+oo)
(4*y)/(4*y-1)-(1*(1-(4*y))) = 0
(4*y)/(4*y-1)-(-4*y)-1 = 0
(4*y)/(4*y-1)+4*y-1 = 0
(4*y)/(4*y-1)+(4*y*(4*y-1))/(4*y-1)+(-1*(4*y-1))/(4*y-1) = 0
4*y*(4*y-1)-1*(4*y-1)+4*y = 0
16*y^2-4*y+1 = 0
16*y^2-4*y+1 = 0
16*y^2-4*y+1 = 0
DELTA = (-4)^2-(1*4*16)
DELTA = -48
DELTA < 0
1 = 0
1/(4*y-1) = 0
1/(4*y-1) = 0 // * 4*y-1
1 = 0
y belongs to the empty set
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