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u in (-oo:+oo)
-4*u = 16/3 // - 16/3
-4*u-(16/3) = 0
-4*u-16/3 = 0
-4*u-16/3 = 0 // + 16/3
-4*u = 16/3 // : -4
u = 16/3/(-4)
u = -4/3
u = -4/3
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