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D( X )
X-0.05 = 0
X-0.05 = 0
X-0.05 = 0
X-0.05 = 0 // + 0.05
X = 0.05
X in (-oo:0.05) U (0.05:+oo)
160 = 5.5/(X-0.05) // - 5.5/(X-0.05)
160-(5.5/(X-0.05)) = 0
160-5.5*(X-0.05)^-1 = 0
160-5.5/(X-0.05) = 0
(160*(X-0.05))/(X-0.05)-5.5/(X-0.05) = 0
160*(X-0.05)-5.5 = 0
160*X-13.5 = 0
(160*X-13.5)/(X-0.05) = 0
(160*X-13.5)/(X-0.05) = 0 // * X-0.05
160*X-13.5 = 0
160*X-13.5 = 0 // + 13.5
160*X = 13.5 // : 160
X = 13.5/160
X = 0.084375
X = 0.084375
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