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v in (-oo:+oo)
5.12 = v/4 // - v/4
5.12-(v/4) = 0
5.12-1/4*v = 0 // - 5.12
-1/4*v = -5.12 // : -1/4
v = -5.12/(-1/4)
v = 20.48
v = 20.48
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