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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
40 = 100*((x-0.1)/x) // - 100*((x-0.1)/x)
40-(100*((x-0.1)/x)) = 0
40-100*x^-1*(x-0.1) = 0
40-100*x^-1*(x-0.1) = 0
10*x^-1-60 = 0
10*x^-1-60 = 0
10*x^-1 = 60 // : 10
x^-1 = 6
-1 < 0
1/(x^1) = 6 // * x^1
1 = 6*x^1 // : 6
1/6 = x^1
x = 1/6
x = 1/6
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