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v in (-oo:+oo)
(-7/3)*v+4/5 = (-1/5)*v-7 // - (-1/5)*v-7
(-7/3)*v-((-1/5)*v)+4/5+7 = 0
(-7/3)*v+(1/5)*v+4/5+7 = 0
39/5-32/15*v = 0 // - 39/5
-32/15*v = -39/5 // : -32/15
v = -39/5/(-32/15)
v = 117/32
v = 117/32
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