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c in (-oo:+oo)
-4 > c/9 // - c/9
-(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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