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Which number completes the inequality? 2/3 < _ < 7/9

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )

Solve 13 + w/7= -18 (w/7 is a fraction)