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n in (-oo:+oo)
2*n = 21/8 // - 21/8
2*n-(21/8) = 0
2*n-21/8 = 0
2*n-21/8 = 0 // + 21/8
2*n = 21/8 // : 2
n = 21/8/2
n = 21/16
n = 21/16
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