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u in (-oo:+oo)
7.5 = u/3 // - u/3
7.5-(u/3) = 0
7.5-1/3*u = 0 // - 7.5
-1/3*u = -7.5 // : -1/3
u = -7.5/(-1/3)
u = 22.50000023
u = 22.50000023
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