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v in (-oo:+oo)
v/12 = 13/7 // - 13/7
v/12-(13/7) = 0
v/12-13/7 = 0
1/12*v-13/7 = 0 // + 13/7
1/12*v = 13/7 // : 1/12
v = 13/7/1/12
v = 156/7
v = 156/7
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