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v in (-oo:+oo)
-4/5 = -5*v // + -5*v
-(-5*v)-4/5 = 0
5*v-4/5 = 0
5*v-4/5 = 0 // + 4/5
5*v = 4/5 // : 5
v = 4/5/5
v = 4/25
v = 4/25
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