(3 5/6+а)-2 1/6=5

[latex](3\frac{5}{6}+a)-2\frac{1}{6}=5[/latex]   раскрываем скобки   [latex]3\frac{5}{6}+a-2\frac{1}{6}=5[/latex]   [latex]a=5+2\frac{1}{6}-3\frac{5}{6}[/latex]   [latex]a=5+\frac{13}{6}-\frac{23}{6}[/latex]   [latex]a=\frac{30+13-23}{6}[/latex]   [latex]a=\frac{20}{6}=\frac{10}{3}=3\frac{1}{3}[/latex]