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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.8 = 12/x // - 12/x
0.8-(12/x) = 0
0.8-12*x^-1 = 0
-12*x^-1 = -0.8 // : -12
x^-1 = 0.06666667
-1 < 0
1/(x^1) = 0.06666667 // * x^1
1 = 0.06666667*x^1 // : 0.06666667
14.99999925 = x^1
x = 14.99999925
x = 14.99999925
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