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v in (-oo:+oo)
17.5 = v/7 // - v/7
17.5-(v/7) = 0
17.5-1/7*v = 0 // - 17.5
-1/7*v = -17.5 // : -1/7
v = -17.5/(-1/7)
v = 122.50000245
v = 122.50000245
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