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