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v in (-oo:+oo)
(-1/5)*v-(1/7) = (-1/3)*v-(5/2) // - (-1/3)*v-(5/2)
(-1/5)*v-((-1/3)*v)-(1/7)+5/2 = 0
(-1/5)*v+(1/3)*v-1/7+5/2 = 0
2/15*v+33/14 = 0 // - 33/14
2/15*v = -33/14 // : 2/15
v = -33/14/2/15
v = -495/28
v = -495/28
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