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v in (-oo:+oo)
v/9 = 3/13 // - 3/13
v/9-(3/13) = 0
v/9-3/13 = 0
1/9*v-3/13 = 0 // + 3/13
1/9*v = 3/13 // : 1/9
v = 3/13/1/9
v = 27/13
v = 27/13
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