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D( y )
3*y = 0
3*y = 0
3*y = 0
3*y = 0 // : 3
y = 0
y in (-oo:0) U (0:+oo)
(5*(2*y-3))/(3*y) = 3 // - 3
(5*(2*y-3))/(3*y)-3 = 0
(5*(2*y-3))/(3*y)+(-3*3*y)/(3*y) = 0
5*(2*y-3)-3*3*y = 0
y-15 = 0
(y-15)/(3*y) = 0
(y-15)/(3*y) = 0 // * 3*y
y-15 = 0
y-15 = 0 // + 15
y = 15
y = 15
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