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v in (-oo:+oo)
4 = (2/9)*v // - (2/9)*v
4-((2/9)*v) = 0
(-2/9)*v+4 = 0
4-2/9*v = 0 // - 4
-2/9*v = -4 // : -2/9
v = -4/(-2/9)
v = 18
v = 18
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