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c in (-oo:+oo)
(-2/3)*c < 6 // - 6
(-2/3)*c-6 < 0
-2/3*c-6 < 0 // + 6
-2/3*c < 6 // : -2/3
c > 6/(-2/3)
c > -9
c in (-9:+oo)
(-9:+oo)
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