Question 959787
First factor out the xy.
{{{(2/4)xy + (14/3)xy - (9/2)xy=xy((1/2) + (14/3) - (9/2))}}}
Then use the common denominator,
{{{(2/4)xy + (14/3)xy - (9/2)xy=xy((3/6) + (28/6) - (27/6))}}}
{{{(2/4)xy + (14/3)xy - (9/2)xy=xy(4/6)}}}
{{{(2/4)xy + (14/3)xy - (9/2)xy=(2/3)xy}}}
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You're right. The book is not.