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v in (-oo:+oo)
(-1/5)*v-(7/2) = (-1/3)*v-(5/2) // - (-1/3)*v-(5/2)
(-1/5)*v-((-1/3)*v)-(7/2)+5/2 = 0
(-1/5)*v+(1/3)*v-7/2+5/2 = 0
2/15*v-1 = 0 // + 1
2/15*v = 1 // : 2/15
v = 1/2/15
v = 15/2
v = 15/2
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