Add. Simplify, if possible. \[ 5 \frac{2}{3}+7 \frac{5}{9} \] \( [?] \frac{[]}{[]} \)

Step 1 ：Convert mixed numbers to improper fractions: \( \frac{17}{3} + \frac{68}{9} \)

Step 2 ：Find a common denominator and add: \( \frac{153}{27} + \frac{204}{27} \)

Step 3 ：Add the numerators and simplify: \( \frac{357}{27} \) = \( 12 \frac{37}{63} \)