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D( x )
x-0.03 = 0
x-0.03 = 0
x-0.03 = 0
x-0.03 = 0 // + 0.03
x = 0.03
x in (-oo:0.03) U (0.03:+oo)
20 = 1/(x-0.03) // - 1/(x-0.03)
20-(1/(x-0.03)) = 0
20-(x-0.03)^-1 = 0
20-1/(x-0.03) = 0
(20*(x-0.03))/(x-0.03)-1/(x-0.03) = 0
20*(x-0.03)-1 = 0
20*x-1.6 = 0
(20*x-1.6)/(x-0.03) = 0
(20*x-1.6)/(x-0.03) = 0 // * x-0.03
20*x-1.6 = 0
20*x-1.6 = 0 // + 1.6
20*x = 1.6 // : 20
x = 1.6/20
x = 0.08
x = 0.08
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