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U in (-oo:+oo)
(5*(14-U))/8 = 10-5*U // - 10-5*U
(5*(14-U))/8-(-5*U)-10 = 0
(5*(14-U))/8+5*U-10 = 0
(5*(14-U))/8+(5*8*U)/8+(-10*8)/8 = 0
5*(14-U)+5*8*U-10*8 = 0
35*U-80+70 = 0
35*U-10 = 0
(35*U-10)/8 = 0
(35*U-10)/8 = 0 // * 8
35*U-10 = 0
35*U-10 = 0 // + 10
35*U = 10 // : 35
U = 10/35
U = 2/7
U = 2/7
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