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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5.1/1.7 = 2.4/x // - 2.4/x
5.1/1.7-(2.4/x) = 0
5.1/1.7-2.4*x^-1 = 0
-2.4*x^-1 = -3 // : -2.4
x^-1 = 1.25
-1 < 0
1/(x^1) = 1.25 // * x^1
1 = 1.25*x^1 // : 1.25
0.8 = x^1
x = 0.8
x = 0.8
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