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V in (-oo:+oo)
2 = (-2/9)*V // - (-2/9)*V
2-((-2/9)*V) = 0
(2/9)*V+2 = 0
2/9*V+2 = 0 // - 2
2/9*V = -2 // : 2/9
V = -2/2/9
V = -9
V = -9
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