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