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D( d )
5*d = 0
5*d = 0
5*d = 0
5*d = 0 // : 5
d = 0
d in (-oo:0) U (0:+oo)
(4-(3*d))/(5*d)+7 = 6 // - 6
(4-(3*d))/(5*d)-6+7 = 0
(4-3*d)/(5*d)-6+7 = 0
(4-3*d)/(5*d)+(-6*5*d)/(5*d)+(5*7*d)/(5*d) = 0
5*7*d-3*d-6*5*d+4 = 0
35*d-33*d+4 = 0
2*d+4 = 0
(2*d+4)/(5*d) = 0
(2*d+4)/(5*d) = 0 // * 5*d
2*d+4 = 0
2*d+4 = 0 // - 4
2*d = -4 // : 2
d = -4/2
d = -2
d = -2
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