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c in (-oo:+oo)
(-3/8)*c > 9 // - 9
(-3/8)*c-9 > 0
-3/8*c-9 > 0 // + 9
-3/8*c > 9 // : -3/8
c < 9/(-3/8)
c < -24
c in (-oo:-24)
(-oo:-24)
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