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D( x )
1-(0.015*x) = 0
1-(0.015*x) = 0
1-(0.015*x) = 0
1-0.015*x = 0
1-0.015*x = 0 // - 1
-0.015*x = -1 // : -0.015
x = -1/(-0.015)
x = 66.66666667
x in (-oo:66.66666667) U (66.66666667:+oo)
x/(1-(0.015*x)) = 0
x/(1-0.015*x) = 0
x = 0
x = 0
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