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u in (-oo:+oo)
4*u = -8/3 // + -8/3
4*u-(-8/3) = 0
4*u+8/3 = 0
4*u+8/3 = 0 // - 8/3
4*u = -8/3 // : 4
u = -8/3/4
u = -2/3
u = -2/3
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