[tex]a) \: (2 + 2 \frac{1}{3} \div \frac{7}{3} ) \div x = 3 \\ \: \: \: \: \: (2 + \frac{7}{3} \div \frac{7}{3} ) \div x = 3 \\ \: \: \: \: \: (2 + 1) \div x = 3 \\ \: \: \: \: \: 3 \div x = 3 = > x = 1[/tex]
[tex]b) \: x \times (2 \frac{2}{3} \times 1 \frac{7}{8} - \frac{7}{2} \div 14) = \frac{1}{4} \\ \: \: \: \: \: x \times ( \frac{8}{3} \times \frac{15}{8} - \frac{7}{2} \times \frac{1}{14} ) = \frac{1}{4} \\ \: \: \: \: \: x \times (5 - \frac{1}{4} ) = \frac{1}{4} \\ \: \: \: \: \: amlificam \: 5 \: cu \: 4 \\ \: \: \: \: \: x \times ( \frac{20}{4} - \frac{1}{4} ) = \frac{1}{4} \\ \: \: \: \: \: x \times \frac{19}{4} = \frac{1}{4} = > x = \frac{1}{4} - \times \frac{4}{19} = \frac{1}{19} [/tex]
