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N in (-oo:+oo)
N/12 < 7 // - 7
N/12-7 < 0
1/12*N-7 < 0 // + 7
1/12*N < 7 // : 1/12
N < 7/1/12
N < 84
N in (-oo:84)
(-oo:84)
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