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u in (-oo:+oo)
12.5 = u/5 // - u/5
12.5-(u/5) = 0
12.5-1/5*u = 0 // - 12.5
-1/5*u = -12.5 // : -1/5
u = -12.5/(-1/5)
u = 62.5
u = 62.5
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