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v in (-oo:+oo)
-((1/4)*v)-2/3 = -1/5 // + -1/5
-((1/4)*v)-2/3-(-1/5) = 0
(-1/4)*v-2/3+1/5 = 0
-1/4*v-7/15 = 0 // + 7/15
-1/4*v = 7/15 // : -1/4
v = 7/15/(-1/4)
v = -28/15
v = -28/15
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