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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
47/12-(1/x) = 15/4 // - 15/4
47/12-(1/x)-(15/4) = 0
47/12-x^-1-15/4 = 0
-1*x^-1 = -1/6 // : -1
x^-1 = 1/6
-1 < 0
1/(x^1) = 1/6 // * x^1
1 = 1/6*x^1 // : 1/6
6 = x^1
x = 6
x = 6
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