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v in (-oo:+oo)
(7/2)*v-(2/5) = (-3/5)*v-3 // - (-3/5)*v-3
(7/2)*v-((-3/5)*v)-(2/5)+3 = 0
(7/2)*v+(3/5)*v-2/5+3 = 0
41/10*v+13/5 = 0 // - 13/5
41/10*v = -13/5 // : 41/10
v = -13/5/41/10
v = -26/41
v = -26/41
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