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