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v in (-oo:+oo)
2*v-9 < (-7/3)*v-7 // - (-7/3)*v-7
2*v-((-7/3)*v)-9+7 < 0
2*v+(7/3)*v-9+7 < 0
13/3*v-2 < 0 // + 2
13/3*v < 2 // : 13/3
v < 2/13/3
v < 6/13
v in (-oo:6/13)
(-oo:6/13)
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