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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
19.28 = 17.3/x // - 17.3/x
19.28-(17.3/x) = 0
19.28-17.3*x^-1 = 0
-17.3*x^-1 = -19.28 // : -17.3
x^-1 = 1.11445087
-1 < 0
1/(x^1) = 1.11445087 // * x^1
1 = 1.11445087*x^1 // : 1.11445087
0.8973029 = x^1
x = 0.8973029
x = 0.8973029
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