3 times the sum of 1/3 of a number and 8 is 11
\(3 ( \frac{1}{3} n+8) =11\\\\ \frac{1}{3} n+8= \frac{11}{3} \\\\ \frac{1}{3} n=\frac{11}{3} -8\\\\ \frac{1}{3} n = \frac{-13}{3} \\\\\boxed {n=-13}\)