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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
14/30 = 1.54/x // - 1.54/x
14/30-(1.54/x) = 0
14/30-1.54*x^-1 = 0
-1.54*x^-1 = -7/15 // : -1.54
x^-1 = 0.30303031
-1 < 0
1/(x^1) = 0.30303031 // * x^1
1 = 0.30303031*x^1 // : 0.30303031
3.29999992 = x^1
x = 3.29999992
x = 3.29999992
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