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v in (-oo:+oo)
4*v = 16/5 // - 16/5
4*v-(16/5) = 0
4*v-16/5 = 0
4*v-16/5 = 0 // + 16/5
4*v = 16/5 // : 4
v = 16/5/4
v = 4/5
v = 4/5
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