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v in (-oo:+oo)
(9*v)/8-((7*v)/4) = -3 // + 3
(9*v)/8-((7*v)/4)+3 = 0
(9*v)/8+(-7/4)*v+3 = 0
3-5/8*v = 0 // - 3
-5/8*v = -3 // : -5/8
v = -3/(-5/8)
v = 24/5
v = 24/5
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