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V in (-oo:+oo)
7*V = -14/9 // + -14/9
7*V-(-14/9) = 0
7*V+14/9 = 0
7*V+14/9 = 0 // - 14/9
7*V = -14/9 // : 7
V = -14/9/7
V = -2/9
V = -2/9
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