Tìm x

giúp tớ với ạa
----- Nội dung ảnh -----
```
11) \(\frac{3}{2} - \frac{1}{4} = \frac{2}{3}\);
12) \(\frac{2}{3} - \frac{4}{7}x = 1 - \frac{1}{2}\);
13) \(-3x + \frac{1}{2} = 2 - \frac{4}{3};\)
14) \(\frac{3}{4} - \frac{5}{6}x = 2 - \frac{2}{3};\)
```