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v in (-oo:+oo)
(-4/3)*v+(5/3)*v = 1/5-(2/5) // - 1/5-(2/5)
(-4/3)*v+(5/3)*v-(1/5)+2/5 = 0
(-4/3)*v+(5/3)*v-1/5+2/5 = 0
1/3*v+1/5 = 0 // - 1/5
1/3*v = -1/5 // : 1/3
v = -1/5/1/3
v = -3/5
v = -3/5
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