7 11 12+18 -- --

$$\frac{7}{12} + \frac{11}{18} = \frac{7 \cdot 3}{12 \cdot 3} + \frac{11 \cdot 2}{18 \cdot 2} = \frac{21}{36} + \frac{22}{36} = \frac{43}{36}$$

Ответ: $$\frac{43}{36}$$