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u in (-oo:+oo)
2 = u/2.56 // - u/2.56
2-(u/2.56) = 0
2-0.390625*u = 0
2-0.390625*u = 0 // - 2
-0.390625*u = -2 // : -0.390625
u = -2/(-0.390625)
u = 5.12
u = 5.12
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