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v in (-oo:+oo)
11.2 = v/7 // - v/7
11.2-(v/7) = 0
11.2-1/7*v = 0 // - 11.2
-1/7*v = -11.2 // : -1/7
v = -11.2/(-1/7)
v = 78.40000157
v = 78.40000157
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