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v in (-oo:+oo)
(2/3)*v-20 = 29 // - 29
(2/3)*v-29-20 = 0
2/3*v-49 = 0 // + 49
2/3*v = 49 // : 2/3
v = 49/2/3
v = 147/2
v = 147/2
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