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v in (-oo:+oo)
22.4 = v/7 // - v/7
22.4-(v/7) = 0
22.4-1/7*v = 0 // - 22.4
-1/7*v = -22.4 // : -1/7
v = -22.4/(-1/7)
v = 156.80000314
v = 156.80000314
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