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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x = 12/60 // - 12/60
8/x-(12/60) = 0
8/x-1/5 = 0
8*x^-1 = 1/5 // : 8
x^-1 = 1/40
-1 < 0
1/(x^1) = 1/40 // * x^1
1 = 1/40*x^1 // : 1/40
40 = x^1
x = 40
x = 40
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