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D( X )
X-25 = 0
X-25 = 0
X-25 = 0
X-25 = 0 // + 25
X = 25
X in (-oo:25) U (25:+oo)
X/(X-25) = 1.083333333 // - 1.083333333
X/(X-25)-1.083333333 = 0
X/(X-25)+(-1.083333333*(X-25))/(X-25) = 0
X-1.083333333*(X-25) = 0
27.083333325-0.083333333*X = 0
(27.083333325-0.083333333*X)/(X-25) = 0
(27.083333325-0.083333333*X)/(X-25) = 0 // * X-25
27.083333325-0.083333333*X = 0
27.083333325-0.083333333*X = 0 // - 27.083333325
-0.083333333*X = -27.083333325 // : -0.083333333
X = -27.083333325/(-0.083333333)
X = 325.0000012
X = 325.0000012
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