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N in (-oo:+oo)
N/50 = 22/40 // - 22/40
N/50-(22/40) = 0
N/50-11/20 = 0
1/50*N-11/20 = 0 // + 11/20
1/50*N = 11/20 // : 1/50
N = 11/20/1/50
N = 55/2
N = 55/2
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