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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/12 = 6.8/x // - 6.8/x
1/12-(6.8/x) = 0
1/12-6.8*x^-1 = 0
-6.8*x^-1 = -1/12 // : -6.8
x^-1 = 0.0122549
-1 < 0
1/(x^1) = 0.0122549 // * x^1
1 = 0.0122549*x^1 // : 0.0122549
81.60001306 = x^1
x = 81.60001306
x = 81.60001306
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