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N in (-oo:+oo)
57/140 = (1/7)*N // - (1/7)*N
57/140-((1/7)*N) = 0
(-1/7)*N+57/140 = 0
57/140-1/7*N = 0 // - 57/140
-1/7*N = -57/140 // : -1/7
N = -57/140/(-1/7)
N = 57/20
N = 57/20
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