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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
75.8 = 19.3/x // - 19.3/x
75.8-(19.3/x) = 0
75.8-19.3*x^-1 = 0
-19.3*x^-1 = -75.8 // : -19.3
x^-1 = 3.92746114
-1 < 0
1/(x^1) = 3.92746114 // * x^1
1 = 3.92746114*x^1 // : 3.92746114
0.25461741 = x^1
x = 0.25461741
x = 0.25461741
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