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D( x )
13-(2*x) = 0
13-(2*x) = 0
13-(2*x) = 0
13-2*x = 0
13-2*x = 0 // - 13
-2*x = -13 // : -2
x = -13/(-2)
x = 13/2
x in (-oo:13/2) U (13/2:+oo)
(x-2)/(13-(2*x)) = 0
(x-2)/(13-2*x) = 0
x-2 = 0 // + 2
x = 2
x = 2
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