Решение уравнений:

1. a) $$rac{1}{6}x = 18$$ $$x = 18 \times 6$$ $$x = 108$$ $$\textbf{Ответ: } x = 108$$
2. б) $$7x + 11,9 = 0$$ $$7x = -11,9$$ $$x = -\frac{11,9}{7}$$ $$x = -1,7$$ $$\textbf{Ответ: } x = -1,7$$
3. в) $$6x - 0,8 = 3x + 2,2$$ $$6x - 3x = 2,2 + 0,8$$ $$3x = 3$$ $$x = \frac{3}{3}$$ $$x = 1$$ $$\textbf{Ответ: } x = 1$$
4. г) $$5x - (7x + 7) = 9$$ $$5x - 7x - 7 = 9$$ $$-2x = 9 + 7$$ $$-2x = 16$$ $$x = \frac{16}{-2}$$ $$x = -8$$ $$\textbf{Ответ: } x = -8$$