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v in (-oo:+oo)
7/5 = v/4 // - v/4
7/5-(v/4) = 0
7/5-1/4*v = 0 // - 7/5
-1/4*v = -7/5 // : -1/4
v = -7/5/(-1/4)
v = 28/5
v = 28/5
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