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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
(275000000-X)/X = 1.75 // - 1.75
(275000000-X)/X-1.75 = 0
(275000000-X)/X+(-1.75*X)/X = 0
275000000-X-1.75*X = 0
275000000-2.75*X = 0
(275000000-2.75*X)/X = 0
(275000000-2.75*X)/X = 0 // * X
275000000-2.75*X = 0
275000000-2.75*X = 0 // - 275000000
-2.75*X = -275000000 // : -2.75
X = -275000000/(-2.75)
X = 100000000
X = 100000000
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