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v in (-oo:+oo)
v/4 = 7/13 // - 7/13
v/4-(7/13) = 0
v/4-7/13 = 0
1/4*v-7/13 = 0 // + 7/13
1/4*v = 7/13 // : 1/4
v = 7/13/1/4
v = 28/13
v = 28/13
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