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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(77.49/x) = 0.35 // - 0.35
1-(77.49/x)-0.35 = 0
1-77.49*x^-1-0.35 = 0
-77.49*x^-1 = -0.65 // : -77.49
x^-1 = 0.00838818
-1 < 0
1/(x^1) = 0.00838818 // * x^1
1 = 0.00838818*x^1 // : 0.00838818
119.21537211 = x^1
x = 119.21537211
x = 119.21537211
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