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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x = 5/13 // - 5/13
10/x-(5/13) = 0
10/x-5/13 = 0
10*x^-1 = 5/13 // : 10
x^-1 = 1/26
-1 < 0
1/(x^1) = 1/26 // * x^1
1 = 1/26*x^1 // : 1/26
26 = x^1
x = 26
x = 26
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