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V in (-oo:+oo)
V/4-3.4 = -9.8 // + 9.8
V/4-3.4+9.8 = 0
1/4*V+6.4 = 0 // - 6.4
1/4*V = -6.4 // : 1/4
V = -6.4/1/4
V = -25.6
V = -25.6
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