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u in (-oo:+oo)
u/12.8 = 8 // - 8
u/12.8-8 = 0
0.078125*u-8 = 0 // + 8
0.078125*u = 8 // : 0.078125
u = 8/0.078125
u = 102.4
u = 102.4
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