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C in (-oo:+oo)
C/(-2) > 6 // - 6
C/(-2)-6 > 0
-1/2*C-6 > 0 // + 6
-1/2*C > 6 // : -1/2
C < 6/(-1/2)
C < -12
C in (-oo:-12)
(-oo:-12)
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