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v in (-oo:+oo)
4*v = 12/7 // - 12/7
4*v-(12/7) = 0
4*v-12/7 = 0
4*v-12/7 = 0 // + 12/7
4*v = 12/7 // : 4
v = 12/7/4
v = 3/7
v = 3/7
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