$a)(\frac{136}{15}-$ $\frac{28}{5}+$ $\frac{62}{10}).$ $\frac{21}{24}$ _______________________________________ $b)\frac{5}{6}+$ $6\frac{5}{6}($ $1.1\frac{5}{20}-$ $9\frac{1}{4})$ $8\frac{1}{3}$

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