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v in (-oo:+oo)
2*v = 14/9 // - 14/9
2*v-(14/9) = 0
2*v-14/9 = 0
2*v-14/9 = 0 // + 14/9
2*v = 14/9 // : 2
v = 14/9/2
v = 7/9
v = 7/9
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