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v in (-oo:+oo)
2*v = 8/5 // - 8/5
2*v-(8/5) = 0
2*v-8/5 = 0
2*v-8/5 = 0 // + 8/5
2*v = 8/5 // : 2
v = 8/5/2
v = 4/5
v = 4/5
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