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N in (-oo:+oo)
N/68 = 8/17 // - 8/17
N/68-(8/17) = 0
N/68-8/17 = 0
1/68*N-8/17 = 0 // + 8/17
1/68*N = 8/17 // : 1/68
N = 8/17/1/68
N = 32
N = 32
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