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v in (-oo:+oo)
v/5 = 13/7 // - 13/7
v/5-(13/7) = 0
v/5-13/7 = 0
1/5*v-13/7 = 0 // + 13/7
1/5*v = 13/7 // : 1/5
v = 13/7/1/5
v = 65/7
v = 65/7
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