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v in (-oo:+oo)
10/7 = 2*v // - 2*v
10/7-(2*v) = 0
10/7-2*v = 0
10/7-2*v = 0 // - 10/7
-2*v = -10/7 // : -2
v = -10/7/(-2)
v = 5/7
v = 5/7
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