6)(n)-=: 3 12 г) -(-1)=2

Решим данные уравнения: б) $$\left(\frac{5}{6} - n\right) - \frac{1}{3} = \frac{5}{12}$$ $$\frac{5}{6} - n = \frac{5}{12} + \frac{1}{3}$$ $$\frac{5}{6} - n = \frac{5}{12} + \frac{4}{12}$$ $$\frac{5}{6} - n = \frac{9}{12}$$ $$n = \frac{5}{6} - \frac{9}{12}$$ $$n = \frac{10}{12} - \frac{9}{12}$$ $$n = \frac{1}{12}$$ г) $$\frac{2}{3} - \left(x - \frac{1}{21}\right) = \frac{2}{7}$$ $$\frac{2}{3} - x + \frac{1}{21} = \frac{2}{7}$$ $$-x = \frac{2}{7} - \frac{2}{3} - \frac{1}{21}$$ $$-x = \frac{2 \cdot 9}{7 \cdot 9} - \frac{2 \cdot 21}{3 \cdot 21} - \frac{1 \cdot 3}{21 \cdot 3}$$ $$-x = \frac{18}{63} - \frac{42}{63} - \frac{3}{63}$$ $$-x = -\frac{27}{63}$$ $$x = \frac{3}{7}$$ Ответ: б) $$\frac{1}{12}$$, г) $$\frac{3}{7}$$