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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12/65.4 = 12/x // - 12/x
12/65.4-(12/x) = 0
12/65.4-12*x^-1 = 0
-12*x^-1 = -0.18348624 // : -12
x^-1 = 0.01529052
-1 < 0
1/(x^1) = 0.01529052 // * x^1
1 = 0.01529052*x^1 // : 0.01529052
65.39999948 = x^1
x = 65.39999948
x = 65.39999948
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