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n in (-oo:+oo)
(n/1)/3 = 21/2 // - 21/2
(n/1)/3-(21/2) = 0
n/3-21/2 = 0
1/3*n-21/2 = 0 // + 21/2
1/3*n = 21/2 // : 1/3
n = 21/2/1/3
n = 63/2
n = 63/2
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