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D( u )
u-3 = 0
u-3 = 0
u-3 = 0
u-3 = 0 // + 3
u = 3
u in (-oo:3) U (3:+oo)
5/(u-3)-2 = -8 // + 8
5/(u-3)-2+8 = 0
5/(u-3)+(-2*(u-3))/(u-3)+(8*(u-3))/(u-3) = 0
8*(u-3)-2*(u-3)+5 = 0
8*u-2*u-24+11 = 0
6*u-13 = 0
(6*u-13)/(u-3) = 0
(6*u-13)/(u-3) = 0 // * u-3
6*u-13 = 0
6*u-13 = 0 // + 13
6*u = 13 // : 6
u = 13/6
u = 13/6
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