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-4≤7x-2<12
Ahora :)
-4≤7x-2<12 ( +2)
-4+2≤7x-2+2 < 12+2
-2≤ 7x < 14 ( ÷7)
-2/7 ≤ 7x÷ 7 < 14/7
-2/7≤ x < 2
Rpta: Cs=[-2/7; 2>