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v in (-oo:+oo)
(-1/4)*v-(1/2) = 3/5 // - 3/5
(-1/4)*v-(1/2)-(3/5) = 0
(-1/4)*v-1/2-3/5 = 0
-1/4*v-11/10 = 0 // + 11/10
-1/4*v = 11/10 // : -1/4
v = 11/10/(-1/4)
v = -22/5
v = -22/5
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