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v in (-oo:+oo)
2/3 = v-7/9 // - v-7/9
2/3-v-(-7/9) = 0
2/3-v+7/9 = 0
13/9-v = 0 // - 13/9
-v = -13/9 // * -1
v = 13/9
v = 13/9
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