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n in (-oo:+oo)
n/2 = 14/7 // - 14/7
n/2-(14/7) = 0
n/2-2 = 0
1/2*n-2 = 0 // + 2
1/2*n = 2 // : 1/2
n = 2/1/2
n = 4
n = 4
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