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D( y )
2*y-1 = 0
2*y-1 = 0
2*y-1 = 0
2*y-1 = 0 // + 1
2*y = 1 // : 2
y = 1/2
y in (-oo:1/2) U (1/2:+oo)
(4*y+3)/(2*y-1) = 3/5 // - 3/5
(4*y+3)/(2*y-1)-(3/5) = 0
(4*y+3)/(2*y-1)-3/5 = 0
(5*(4*y+3))/(5*(2*y-1))+(-3*(2*y-1))/(5*(2*y-1)) = 0
5*(4*y+3)-3*(2*y-1) = 0
14*y+18 = 0
(14*y+18)/(5*(2*y-1)) = 0
(14*y+18)/(5*(2*y-1)) = 0 // * 5*(2*y-1)
14*y+18 = 0
14*y+18 = 0 // - 18
14*y = -18 // : 14
y = -18/14
y = -9/7
y = -9/7
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