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u in (-oo:+oo)
(4*(24-u))/9 = 12-4*u // - 12-4*u
(4*(24-u))/9-(-4*u)-12 = 0
(4*(24-u))/9+4*u-12 = 0
(4*(24-u))/9+(4*9*u)/9+(-12*9)/9 = 0
4*(24-u)+4*9*u-12*9 = 0
32*u-108+96 = 0
32*u-12 = 0
(32*u-12)/9 = 0
(32*u-12)/9 = 0 // * 9
32*u-12 = 0
32*u-12 = 0 // + 12
32*u = 12 // : 32
u = 12/32
u = 3/8
u = 3/8
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