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u in (-oo:+oo)
24 = (2/3)*u // - (2/3)*u
24-((2/3)*u) = 0
(-2/3)*u+24 = 0
24-2/3*u = 0 // - 24
-2/3*u = -24 // : -2/3
u = -24/(-2/3)
u = 36
u = 36
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