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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x = 60/5 // - 60/5
10/x-(60/5) = 0
10/x-12 = 0
10*x^-1 = 12 // : 10
x^-1 = 6/5
-1 < 0
1/(x^1) = 6/5 // * x^1
1 = 6/5*x^1 // : 6/5
5/6 = x^1
x = 5/6
x = 5/6
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