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D( x )
1-(5*e^0.01*x) = 0
1-(5*e^0.01*x) = 0
1-(5*e^0.01*x) = 0
1-5*e^0.01*x = 0
1-5*e^0.01*x = 0 // - 1
-5*e^0.01*x = -1 // : -5*e^0.01
x = -1/(-5*e^0.01)
x in (-oo:-1/(-5*e^0.01)) U (-1/(-5*e^0.01):+oo)
40/(1-(5*e^0.01*x)) = 200 // - 200
40/(1-(5*e^0.01*x))-200 = 0
40/(1-5*e^0.01*x)-200 = 0
40/(1-5*e^0.01*x)+(-200*(1-5*e^0.01*x))/(1-5*e^0.01*x) = 0
40-200*(1-5*e^0.01*x) = 0
1000*e^0.01*x-160 = 0
(1000*e^0.01*x-160)/(1-5*e^0.01*x) = 0
(1000*e^0.01*x-160)/(1-5*e^0.01*x) = 0 // * 1-5*e^0.01*x
1000*e^0.01*x-160 = 0
1000*e^0.01*x-160 = 0 // + 160
1000*e^0.01*x = 160 // : 1000*e^0.01
x = 160/(1000*e^0.01)
x = (4*e^-0.01)/25
x = (4*e^-0.01)/25
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