3) Реши уравнение: 7-(x+1\frac{3}{5})=2\frac{4}{5}

Решим уравнение:

$$7-(x+1\frac{3}{5})=2\frac{4}{5}$$ $$7-x-1\frac{3}{5}=2\frac{4}{5}$$ $$6\frac{5}{5}-x-1\frac{3}{5}=2\frac{4}{5}$$ $$5\frac{2}{5}-x=2\frac{4}{5}$$ $$-x=2\frac{4}{5}-5\frac{2}{5}$$ $$-x=2\frac{4}{5}-4\frac{7}{5}$$ $$-x=-2\frac{3}{5}$$ $$x=2\frac{3}{5}$$

Ответ: $$x=2\frac{3}{5}$$