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S in (-oo:+oo)
S/3 < -1 // + 1
S/3+1 < 0
1/3*S+1 < 0 // - 1
1/3*S < -1 // : 1/3
S < -1/1/3
S < -3
S in (-oo:-3)
(-oo:-3)
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