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v in (-oo:+oo)
-((2/5)*v)-2/3 = 1/2 // - 1/2
-((2/5)*v)-2/3-(1/2) = 0
(-2/5)*v-2/3-1/2 = 0
-2/5*v-7/6 = 0 // + 7/6
-2/5*v = 7/6 // : -2/5
v = 7/6/(-2/5)
v = -35/12
v = -35/12
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