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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) = 2.4 // - 2.4
(95-x)/(x-25)-2.4 = 0
(95-x)/(x-25)+(-2.4*(x-25))/(x-25) = 0
95-2.4*(x-25)-x = 0
155-3.4*x = 0
(155-3.4*x)/(x-25) = 0
(155-3.4*x)/(x-25) = 0 // * x-25
155-3.4*x = 0
155-3.4*x = 0 // - 155
-3.4*x = -155 // : -3.4
x = -155/(-3.4)
x = 45.58823529
x = 45.58823529
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