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v in (-oo:+oo)
((5*v)/4)/10 = 4/5 // - 4/5
((5*v)/4)/10-(4/5) = 0
((5*v)/4)/10-4/5 = 0
1/8*v-4/5 = 0 // + 4/5
1/8*v = 4/5 // : 1/8
v = 4/5/1/8
v = 32/5
v = 32/5
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