a)     \(2{2 \over 3}.x + 8{2 \over 3} = 3{1 \over 3}\)

\(\frac{8}{3}x+\frac{26}{3}=\frac{10}{3}\)

\(8x+26=10\)

\(8x=10-26\)

\(8x=-16\)

\(x=-16 \div 8\)

\(x=-2\)

b)    \(3{2 \over 7}.x - {1 \over 8} = 2{3 \over 4}\)

\(\frac{23}{7}x-\frac{1}{8}=\frac{11}{4}\)

\(\frac{23}{7}x=\frac{22}{8}+\frac{1}{8}\)

\(\frac{23}{7}x=\frac{23}{8}\)

\(x=\frac{23}{8} \div \frac{23}{7}\)

\(x=\frac{23}{8} .\frac{7}{23}\)

\(x=\frac{7}{8}\)