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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/100 = 8.38/x // - 8.38/x
5/100-(8.38/x) = 0
5/100-8.38*x^-1 = 0
-8.38*x^-1 = -1/20 // : -8.38
x^-1 = 0.00596659
-1 < 0
1/(x^1) = 0.00596659 // * x^1
1 = 0.00596659*x^1 // : 0.00596659
167.59991888 = x^1
x = 167.59991888
x = 167.59991888
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