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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
(5*(5*v-4))/(5*10)+(-4*10)/(5*10) = 0
5*(5*v-4)-4*10 = 0
25*v-60 = 0
(25*v-60)/(5*10) = 0
(25*v-60)/(5*10) = 0 // * 5*10
25*v-60 = 0
25*v-60 = 0 // + 60
25*v = 60 // : 25
v = 60/25
v = 12/5
v = 12/5
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