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u in (-oo:+oo)
2 = u/5.12 // - u/5.12
2-(u/5.12) = 0
2-0.1953125*u = 0
2-0.1953125*u = 0 // - 2
-0.1953125*u = -2 // : -0.1953125
u = -2/(-0.1953125)
u = 10.24
u = 10.24
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