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v in (-oo:+oo)
(1/2)*((61/9)*v-(13/6)) = 0
(1/2)*((61/9)*v-13/6) = 0
1/2*(61/9*v-13/6) = 0
61/9*v-13/6 = 0 // + 13/6
61/9*v = 13/6 // : 61/9
v = 13/6/61/9
v = 39/122
v = 39/122
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