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v in (-oo:+oo)
(1/3)*v-(9/5) = -1/2 // + -1/2
(1/3)*v-(9/5)-(-1/2) = 0
(1/3)*v-9/5+1/2 = 0
1/3*v-13/10 = 0 // + 13/10
1/3*v = 13/10 // : 1/3
v = 13/10/1/3
v = 39/10
v = 39/10
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