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c in (-oo:+oo)
(-1/3)*c < -7 // + 7
(-1/3)*c+7 < 0
7-1/3*c < 0 // - 7
-1/3*c < -7 // : -1/3
c > -7/(-1/3)
c > 21
c in (21:+oo)
(21:+oo)
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