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u in (-oo:+oo)
(u-3)/8 = 5/6 // - 5/6
(u-3)/8-(5/6) = 0
(u-3)/8-5/6 = 0
(6*(u-3))/(6*8)+(-5*8)/(6*8) = 0
6*(u-3)-5*8 = 0
6*u-58 = 0
(6*u-58)/(6*8) = 0
(6*u-58)/(6*8) = 0 // * 6*8
6*u-58 = 0
6*u-58 = 0 // + 58
6*u = 58 // : 6
u = 58/6
u = 29/3
u = 29/3
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