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n in (-oo:+oo)
n/2 = 10/4 // - 10/4
n/2-(10/4) = 0
n/2-5/2 = 0
1/2*n-5/2 = 0 // + 5/2
1/2*n = 5/2 // : 1/2
n = 5/2/1/2
n = 5
n = 5
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