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v in (-oo:+oo)
(-4/5)*v-(8/3) = 4/9 // - 4/9
(-4/5)*v-(8/3)-(4/9) = 0
(-4/5)*v-8/3-4/9 = 0
-4/5*v-28/9 = 0 // + 28/9
-4/5*v = 28/9 // : -4/5
v = 28/9/(-4/5)
v = -35/9
v = -35/9
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