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v in (-oo:+oo)
(-2/3)*v+7 = (-7/3)*v-(1/5) // - (-7/3)*v-(1/5)
(-2/3)*v-((-7/3)*v)+1/5+7 = 0
(-2/3)*v+(7/3)*v+1/5+7 = 0
5/3*v+36/5 = 0 // - 36/5
5/3*v = -36/5 // : 5/3
v = -36/5/5/3
v = -108/25
v = -108/25
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