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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)
(95-x)/(x-25) = 0
95-x = 0 // - 95
-x = -95 // * -1
x = 95
x = 95
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