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v in (-oo:+oo)
(2/3)*v-4 = 3 // - 3
(2/3)*v-4-3 = 0
2/3*v-7 = 0 // + 7
2/3*v = 7 // : 2/3
v = 7/2/3
v = 21/2
v = 21/2
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