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D( y )
2*y = 0
2*y = 0
2*y = 0
2*y = 0 // : 2
y = 0
y in (-oo:0) U (0:+oo)
(5*y+4)/(2*y) = -2/3 // + -2/3
(5*y+4)/(2*y)-(-2/3) = 0
(5*y+4)/(2*y)+2/3 = 0
(3*(5*y+4))/(2*3*y)+(2*2*y)/(2*3*y) = 0
3*(5*y+4)+2*2*y = 0
19*y+12 = 0
(19*y+12)/(2*3*y) = 0
(19*y+12)/(2*3*y) = 0 // * 2*3*y
19*y+12 = 0
19*y+12 = 0 // - 12
19*y = -12 // : 19
y = -12/19
y = -12/19
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