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D( x )
x-5 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x in (-oo:5) U (5:+oo)
2/13 = 2/(x-5) // - 2/(x-5)
2/13-(2/(x-5)) = 0
2/13-2*(x-5)^-1 = 0
2/13-2/(x-5) = 0
(-2*13)/(13*(x-5))+(2*(x-5))/(13*(x-5)) = 0
2*(x-5)-2*13 = 0
2*x-36 = 0
(2*x-36)/(13*(x-5)) = 0
(2*x-36)/(13*(x-5)) = 0 // * 13*(x-5)
2*x-36 = 0
2*x-36 = 0 // + 36
2*x = 36 // : 2
x = 36/2
x = 18
x = 18
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