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u in (-oo:+oo)
(5*u+1)/3 = (7*u+2)/6+4 // - (7*u+2)/6+4
(5*u+1)/3-((7*u+2)/6)-4 = 0
(5*u+1)/3+(-1*(7*u+2))/6-4 = 0
(6*(5*u+1))/(3*6)+(-1*3*(7*u+2))/(3*6)+(-4*3*6)/(3*6) = 0
6*(5*u+1)-1*3*(7*u+2)-4*3*6 = 0
9*u-72 = 0
(9*u-72)/(3*6) = 0
(9*u-72)/(3*6) = 0 // * 3*6
9*u-72 = 0
9*u-72 = 0 // + 72
9*u = 72 // : 9
u = 72/9
u = 8
u = 8
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