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v in (-oo:+oo)
5/9 = v/7 // - v/7
5/9-(v/7) = 0
5/9-1/7*v = 0 // - 5/9
-1/7*v = -5/9 // : -1/7
v = -5/9/(-1/7)
v = 35/9
v = 35/9
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