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v in (-oo:+oo)
15/7 = 5*v // - 5*v
15/7-(5*v) = 0
15/7-5*v = 0
15/7-5*v = 0 // - 15/7
-5*v = -15/7 // : -5
v = -15/7/(-5)
v = 3/7
v = 3/7
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