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u in (-oo:+oo)
15/2 = u/18 // - u/18
15/2-(u/18) = 0
15/2-1/18*u = 0 // - 15/2
-1/18*u = -15/2 // : -1/18
u = -15/2/(-1/18)
u = 135
u = 135
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