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v in (-oo:+oo)
5*v-(19/(-3)) = -7 // + 7
5*v-(19/(-3))+7 = 0
5*v+19/3+7 = 0
5*v+40/3 = 0 // - 40/3
5*v = -40/3 // : 5
v = -40/3/5
v = -8/3
v = -8/3
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