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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
78/x = 6.5 // - 6.5
78/x-6.5 = 0
78*x^-1 = 6.5 // : 78
x^-1 = 0.08333333
-1 < 0
1/(x^1) = 0.08333333 // * x^1
1 = 0.08333333*x^1 // : 0.08333333
12.00000048 = x^1
x = 12.00000048
x = 12.00000048
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