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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)
(0.3*x+5)/(x+25) = 0.27 // - 0.27
(0.3*x+5)/(x+25)-0.27 = 0
(0.3*x+5)/(x+25)+(-0.27*(x+25))/(x+25) = 0
0.3*x-0.27*(x+25)+5 = 0
0.03*x-1.75 = 0
(0.03*x-1.75)/(x+25) = 0
(0.03*x-1.75)/(x+25) = 0 // * x+25
0.03*x-1.75 = 0
0.03*x-1.75 = 0 // + 1.75
0.03*x = 1.75 // : 0.03
x = 1.75/0.03
x = 58.33333333
x = 58.33333333
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