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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5.22/13.92 = 8/x // - 8/x
5.22/13.92-(8/x) = 0
5.22/13.92-8*x^-1 = 0
-8*x^-1 = -0.375 // : -8
x^-1 = 0.046875
-1 < 0
1/(x^1) = 0.046875 // * x^1
1 = 0.046875*x^1 // : 0.046875
21.33333333 = x^1
x = 21.33333333
x = 21.33333333
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