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c in (-oo:+oo)
c/9 < -4 // + 4
c/9+4 < 0
1/9*c+4 < 0 // - 4
1/9*c < -4 // : 1/9
c < -4/1/9
c < -36
c in (-oo:-36)
(-oo:-36)
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