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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6.5/18 = 8/x // - 8/x
6.5/18-(8/x) = 0
6.5/18-8*x^-1 = 0
-8*x^-1 = -0.36111111 // : -8
x^-1 = 0.04513889
-1 < 0
1/(x^1) = 0.04513889 // * x^1
1 = 0.04513889*x^1 // : 0.04513889
22.15384561 = x^1
x = 22.15384561
x = 22.15384561
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