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n in (-oo:+oo)
n/7 < 84 // - 84
n/7-84 < 0
1/7*n-84 < 0 // + 84
1/7*n < 84 // : 1/7
n < 84/1/7
n < 588
n in (-oo:588)
(-oo:588)
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