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u in (-oo:+oo)
12.8 = u/2 // - u/2
12.8-(u/2) = 0
12.8-1/2*u = 0 // - 12.8
-1/2*u = -12.8 // : -1/2
u = -12.8/(-1/2)
u = 25.6
u = 25.6
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