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n in (-oo:+oo)
n/14 = 7/2 // - 7/2
n/14-(7/2) = 0
n/14-7/2 = 0
1/14*n-7/2 = 0 // + 7/2
1/14*n = 7/2 // : 1/14
n = 7/2/1/14
n = 49
n = 49
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