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u in (-oo:+oo)
5.12 = u/4 // - u/4
5.12-(u/4) = 0
5.12-1/4*u = 0 // - 5.12
-1/4*u = -5.12 // : -1/4
u = -5.12/(-1/4)
u = 20.48
u = 20.48
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