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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x-(1/3) = 5/x // - 5/x
7/x-(5/x)-(1/3) = 0
7/x-5*x^-1-1/3 = 0
2*x^-1 = 1/3 // : 2
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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