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c in (-oo:+oo)
(-2/3)*c > 16 // - 16
(-2/3)*c-16 > 0
-2/3*c-16 > 0 // + 16
-2/3*c > 16 // : -2/3
c < 16/(-2/3)
c < -24
c in (-oo:-24)
(-oo:-24)
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