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D( D )
D = 0
D = 0
D = 0
D in (-oo:0) U (0:+oo)
(0.0486*85000)/3000 = (90/D)/2 // - (90/D)/2
(0.0486*85000)/3000-((90/D)/2) = 0
(0.0486*85000)/3000-45*D^-1 = 0
-45*D^-1 = -1377/1000 // : -45
D^-1 = 153/5000
-1 < 0
1/(D^1) = 153/5000 // * D^1
1 = 153/5000*D^1 // : 153/5000
5000/153 = D^1
D = 5000/153
D = 5000/153
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