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v in (-oo:+oo)
15 = (-5/9)*v // - (-5/9)*v
15-((-5/9)*v) = 0
(5/9)*v+15 = 0
5/9*v+15 = 0 // - 15
5/9*v = -15 // : 5/9
v = -15/5/9
v = -27
v = -27
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