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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
26/x = 12/2 // - 12/2
26/x-(12/2) = 0
26/x-6 = 0
26*x^-1 = 6 // : 26
x^-1 = 3/13
-1 < 0
1/(x^1) = 3/13 // * x^1
1 = 3/13*x^1 // : 3/13
13/3 = x^1
x = 13/3
x = 13/3
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