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v in (-oo:+oo)
13*v = 1/3 // - 1/3
13*v-(1/3) = 0
13*v-1/3 = 0
13*v-1/3 = 0 // + 1/3
13*v = 1/3 // : 13
v = 1/3/13
v = 1/39
v = 1/39
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