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v in (-oo:+oo)
(2/5)*v-(5/2) = -7/3 // + -7/3
(2/5)*v-(5/2)-(-7/3) = 0
(2/5)*v-5/2+7/3 = 0
2/5*v-1/6 = 0 // + 1/6
2/5*v = 1/6 // : 2/5
v = 1/6/2/5
v = 5/12
v = 5/12
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