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v in (-oo:+oo)
28 = (4/7)*v // - (4/7)*v
28-((4/7)*v) = 0
(-4/7)*v+28 = 0
28-4/7*v = 0 // - 28
-4/7*v = -28 // : -4/7
v = -28/(-4/7)
v = 49
v = 49
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