1.108 Решите уравнение:

a) $$x + \frac{5}{18} = \frac{11}{36} \implies x = \frac{11}{36} - \frac{5}{18} = \frac{11}{36} - \frac{10}{36} = \frac{1}{36}$$.
б) $$\frac{7}{12} - x = \frac{5}{9} \implies x = \frac{7}{12} - \frac{5}{9} = \frac{21}{36} - \frac{20}{36} = \frac{1}{36}$$.
в) $$\frac{9}{16} \cdot x = \frac{3}{8} \implies x = \frac{3}{8} : \frac{9}{16} = \frac{3}{8} \cdot \frac{16}{9} = \frac{1}{1} \cdot \frac{2}{3} = \frac{2}{3}$$.