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V in (-oo:+oo)
V/4 = 7/4 // - 7/4
V/4-(7/4) = 0
V/4-7/4 = 0
1/4*V-7/4 = 0 // + 7/4
1/4*V = 7/4 // : 1/4
V = 7/4/1/4
V = 7
V = 7
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