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