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v in (-oo:+oo)
(2/9)*v+1 = 4 // - 4
(2/9)*v-4+1 = 0
2/9*v-3 = 0 // + 3
2/9*v = 3 // : 2/9
v = 3/2/9
v = 27/2
v = 27/2
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