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u in (-oo:+oo)
(3*(6-u))/4 = 4-3*u // - 4-3*u
(3*(6-u))/4-(-3*u)-4 = 0
(3*(6-u))/4+3*u-4 = 0
(3*(6-u))/4+(3*4*u)/4+(-4*4)/4 = 0
3*(6-u)+3*4*u-4*4 = 0
9*u-16+18 = 0
9*u+2 = 0
(9*u+2)/4 = 0
(9*u+2)/4 = 0 // * 4
9*u+2 = 0
9*u+2 = 0 // - 2
9*u = -2 // : 9
u = -2/9
u = -2/9
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