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v in (-oo:+oo)
(5/9)*v-2 < 4*v-(7/3) // - 4*v-(7/3)
(5/9)*v-(4*v)+7/3-2 < 0
(5/9)*v-4*v+7/3-2 < 0
1/3-31/9*v < 0 // - 1/3
-31/9*v < -1/3 // : -31/9
v > -1/3/(-31/9)
v > 3/31
v in (3/31:+oo)
(3/31:+oo)
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