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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
97.5/100 = 50/x // - 50/x
97.5/100-(50/x) = 0
97.5/100-50*x^-1 = 0
-50*x^-1 = -0.975 // : -50
x^-1 = 0.0195
-1 < 0
1/(x^1) = 0.0195 // * x^1
1 = 0.0195*x^1 // : 0.0195
51.28205128 = x^1
x = 51.28205128
x = 51.28205128
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