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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)
(5-(0.1*x))/(x+25) = 0.05 // - 0.05
(5-(0.1*x))/(x+25)-0.05 = 0
(5-0.1*x)/(x+25)-0.05 = 0
(5-0.1*x)/(x+25)+(-0.05*(x+25))/(x+25) = 0
5-0.05*(x+25)-0.1*x = 0
3.75-0.15*x = 0
(3.75-0.15*x)/(x+25) = 0
(3.75-0.15*x)/(x+25) = 0 // * x+25
3.75-0.15*x = 0
3.75-0.15*x = 0 // - 3.75
-0.15*x = -3.75 // : -0.15
x = -3.75/(-0.15)
x = 25
x = 25
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