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v in (-oo:+oo)
15/8 = 3*v // - 3*v
15/8-(3*v) = 0
15/8-3*v = 0
15/8-3*v = 0 // - 15/8
-3*v = -15/8 // : -3
v = -15/8/(-3)
v = 5/8
v = 5/8
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