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v in (-oo:+oo)
v/21 = 4/6 // - 4/6
v/21-(4/6) = 0
v/21-2/3 = 0
1/21*v-2/3 = 0 // + 2/3
1/21*v = 2/3 // : 1/21
v = 2/3/1/21
v = 14
v = 14
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