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v in (-oo:+oo)
(-1/3)*v+2/5 = -1/2 // + -1/2
(-1/3)*v+2/5-(-1/2) = 0
(-1/3)*v+2/5+1/2 = 0
9/10-1/3*v = 0 // - 9/10
-1/3*v = -9/10 // : -1/3
v = -9/10/(-1/3)
v = 27/10
v = 27/10
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