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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5.8 = 12/x // - 12/x
5.8-(12/x) = 0
5.8-12*x^-1 = 0
-12*x^-1 = -5.8 // : -12
x^-1 = 0.48333333
-1 < 0
1/(x^1) = 0.48333333 // * x^1
1 = 0.48333333*x^1 // : 0.48333333
2.06896553 = x^1
x = 2.06896553
x = 2.06896553
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