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