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v in (-oo:+oo)
8/7 = v/10 // - v/10
8/7-(v/10) = 0
8/7-1/10*v = 0 // - 8/7
-1/10*v = -8/7 // : -1/10
v = -8/7/(-1/10)
v = 80/7
v = 80/7
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