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u in (-oo:+oo)
5 = u/12.5 // - u/12.5
5-(u/12.5) = 0
5-0.08*u = 0
5-0.08*u = 0 // - 5
-0.08*u = -5 // : -0.08
u = -5/(-0.08)
u = 62.5
u = 62.5
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