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v in (-oo:+oo)
15/2 = 5*v // - 5*v
15/2-(5*v) = 0
15/2-5*v = 0
15/2-5*v = 0 // - 15/2
-5*v = -15/2 // : -5
v = -15/2/(-5)
v = 3/2
v = 3/2
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