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V in (-oo:+oo)
V/9 = -3.7 // + 3.7
V/9+3.7 = 0
1/9*V+3.7 = 0 // - 3.7
1/9*V = -3.7 // : 1/9
V = -3.7/1/9
V = -33.30000033
V = -33.30000033
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