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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
87.5/100 = 15/x // - 15/x
87.5/100-(15/x) = 0
87.5/100-15*x^-1 = 0
-15*x^-1 = -0.875 // : -15
x^-1 = 0.05833333
-1 < 0
1/(x^1) = 0.05833333 // * x^1
1 = 0.05833333*x^1 // : 0.05833333
17.14285812 = x^1
x = 17.14285812
x = 17.14285812
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