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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4.1/9.9 = 5.2/x // - 5.2/x
4.1/9.9-(5.2/x) = 0
4.1/9.9-5.2*x^-1 = 0
-5.2*x^-1 = -0.41414141 // : -5.2
x^-1 = 0.07964258
-1 < 0
1/(x^1) = 0.07964258 // * x^1
1 = 0.07964258*x^1 // : 0.07964258
12.5560975 = x^1
x = 12.5560975
x = 12.5560975
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