a) 1\frac{1}{3} – x = 2\frac{5}{6}
-x = 2\frac{5}{6} - 1\frac{1}{3}
-x = 2\frac{5}{6} - 1\frac{2}{6}
-x = 1\frac{3}{6}
-x = 1\frac{1}{2}
x = -1\frac{1}{2}
x = -1,5
б) -2\frac{2}{7} + x = -4\frac{1}{14}
x = -4\frac{1}{14} + 2\frac{2}{7}
x = -4\frac{1}{14} + 2\frac{4}{14}
x = -1\frac{11}{14}
Ответ: а) -1,5; б) -1\frac{11}{14}