Решение:
- \( x + \frac{5}{18} = \frac{11}{18} \)
- \( x = \frac{11}{18} - \frac{5}{18} \)
- \( x = \frac{11-5}{18} \)
- \( x = \frac{6}{18} = \frac{1}{3} \)
- \( x - \frac{8}{23} = \frac{15}{23} \)
- \( x = \frac{15}{23} + \frac{8}{23} \)
- \( x = \frac{15+8}{23} \)
- \( x = \frac{23}{23} = 1 \)
- \( x = \frac{17}{30} \)
Ответ: \( x = \frac{1}{3} \); \( x = 1 \); \( x = \frac{17}{30} \).