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v in (-oo:+oo)
(-5/3)*v-(1/5) = (2/5)*v-7 // - (2/5)*v-7
(-5/3)*v-((2/5)*v)-(1/5)+7 = 0
(-5/3)*v+(-2/5)*v-1/5+7 = 0
34/5-31/15*v = 0 // - 34/5
-31/15*v = -34/5 // : -31/15
v = -34/5/(-31/15)
v = 102/31
v = 102/31
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