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