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v in (-oo:+oo)
2*v = 4/9 // - 4/9
2*v-(4/9) = 0
2*v-4/9 = 0
2*v-4/9 = 0 // + 4/9
2*v = 4/9 // : 2
v = 4/9/2
v = 2/9
v = 2/9
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