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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
((4*d+1)/d)/9 = -3/(-2) // + -3/(-2)
((4*d+1)/d)/9-(-3/(-2)) = 0
((4*d+1)/d)/9-3/2 = 0
(4*d+1)/(9*d)-3/2 = 0
(2*(4*d+1))/(2*9*d)+(-3*9*d)/(2*9*d) = 0
2*(4*d+1)-3*9*d = 0
2-19*d = 0
(2-19*d)/(2*9*d) = 0
(2-19*d)/(2*9*d) = 0 // * 2*9*d
2-19*d = 0
2-19*d = 0 // - 2
-19*d = -2 // : -19
d = -2/(-19)
d = 2/19
d = 2/19
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