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N in (-oo:+oo)
N/10 = 2*5 // - 2*5
N/10-(2*5) = 0
N/10-10 = 0
1/10*N-10 = 0 // + 10
1/10*N = 10 // : 1/10
N = 10/1/10
N = 100
N = 100
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