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v in (-oo:+oo)
(5*v-4)/10 = (4/5)*v // - (4/5)*v
(5*v-4)/10-((4/5)*v) = 0
(5*v-4)/10+(-4/5)*v = 0
(5*v-4)/10+(-4*v)/5 = 0
(5*(5*v-4))/(5*10)+(-4*10*v)/(5*10) = 0
5*(5*v-4)-4*10*v = 0
-15*v-20 = 0
(-15*v-20)/(5*10) = 0
(-15*v-20)/(5*10) = 0 // * 5*10
-15*v-20 = 0
-15*v-20 = 0 // + 20
-15*v = 20 // : -15
v = 20/(-15)
v = -4/3
v = -4/3
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