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v in (-oo:+oo)
(7/9)*v-6 = 14 // - 14
(7/9)*v-14-6 = 0
7/9*v-20 = 0 // + 20
7/9*v = 20 // : 7/9
v = 20/7/9
v = 180/7
v = 180/7
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