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u in (-oo:+oo)
4.8 = u/3 // - u/3
4.8-(u/3) = 0
4.8-1/3*u = 0 // - 4.8
-1/3*u = -4.8 // : -1/3
u = -4.8/(-1/3)
u = 14.40000014
u = 14.40000014
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