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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6.7/11.6 = 8.3/x // - 8.3/x
6.7/11.6-(8.3/x) = 0
6.7/11.6-8.3*x^-1 = 0
-8.3*x^-1 = -0.57758621 // : -8.3
x^-1 = 0.0695887
-1 < 0
1/(x^1) = 0.0695887 // * x^1
1 = 0.0695887*x^1 // : 0.0695887
14.37014918 = x^1
x = 14.37014918
x = 14.37014918
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