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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x+13/3 = 7/x // - 7/x
1/x-(7/x)+13/3 = 0
1/x-7*x^-1+13/3 = 0
-6*x^-1 = -13/3 // : -6
x^-1 = 13/18
-1 < 0
1/(x^1) = 13/18 // * x^1
1 = 13/18*x^1 // : 13/18
18/13 = x^1
x = 18/13
x = 18/13
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