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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(33.8/x) = 0.35 // - 0.35
1-(33.8/x)-0.35 = 0
1-33.8*x^-1-0.35 = 0
-33.8*x^-1 = -0.65 // : -33.8
x^-1 = 0.01923077
-1 < 0
1/(x^1) = 0.01923077 // * x^1
1 = 0.01923077*x^1 // : 0.01923077
51.99999792 = x^1
x = 51.99999792
x = 51.99999792
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