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v in (-oo:+oo)
(4/7)*v-1/2 = -1/3 // + -1/3
(4/7)*v-1/2-(-1/3) = 0
(4/7)*v-1/2+1/3 = 0
4/7*v-1/6 = 0 // + 1/6
4/7*v = 1/6 // : 4/7
v = 1/6/4/7
v = 7/24
v = 7/24
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