Cool off with a free medium Slurpee at 7-Eleven

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Get a free medium Slurpee at 7-Eleven.

Text SIXFLAGS to 711711 to get a mobile coupon to show at the store good for the free frozen treat. No purchase is necessary to get the offer, good through Dec. 31.

Also, download the free 7-Rewards app, which offers more freebies with mobile coupons found…