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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5.7/17.1 = 19.2/x // - 19.2/x
5.7/17.1-(19.2/x) = 0
5.7/17.1-19.2*x^-1 = 0
-19.2*x^-1 = -0.33333333 // : -19.2
x^-1 = 0.01736111
-1 < 0
1/(x^1) = 0.01736111 // * x^1
1 = 0.01736111*x^1 // : 0.01736111
57.60000369 = x^1
x = 57.60000369
x = 57.60000369
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