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v in (-oo:+oo)
56.9/321 = v/298 // - v/298
56.9/321-(v/298) = 0
0.17725857-1/298*v = 0 // - 0.17725857
-1/298*v = -0.17725857 // : -1/298
v = -0.17725857/(-1/298)
v = 52.82312781
v = 52.82312781
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