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n in (-oo:+oo)
3 <= -((1/8)*n)-1 // + -((1/8)*n)-1
(1/8)*n+1+3 <= 0
1/8*n+4 <= 0 // - 4
1/8*n <= -4 // : 1/8
n <= -4/1/8
n <= -32
n in (-oo:-32>
(-oo:-32>
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