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D( y )
4*y-3 = 0
4*y-3 = 0
4*y-3 = 0
4*y-3 = 0 // + 3
4*y = 3 // : 4
y = 3/4
y in (-oo:3/4) U (3/4:+oo)
3-(4/(4*y-3)) = 23/(4*y-3) // - 23/(4*y-3)
3-(4/(4*y-3))-(23/(4*y-3)) = 0
3-4*(4*y-3)^-1-23*(4*y-3)^-1 = 0
3-4/(4*y-3)-23/(4*y-3) = 0
(3*(4*y-3))/(4*y-3)-4/(4*y-3)-23/(4*y-3) = 0
3*(4*y-3)-23-4 = 0
12*y-27-9 = 0
12*y-36 = 0
(12*y-36)/(4*y-3) = 0
(12*y-36)/(4*y-3) = 0 // * 4*y-3
12*y-36 = 0
12*y-36 = 0 // + 36
12*y = 36 // : 12
y = 36/12
y = 3
y = 3
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