Tìm x; y; z biết

----- Nội dung ảnh -----
```
5) $\frac{x}{30} - \frac{y}{10} - \frac{z}{6} = 92$
6) $\frac{x}{2} - \frac{y}{4} = 12$
7) $\frac{x}{3} - \frac{y}{5} - \frac{z}{7} = 99$
8) $\frac{x}{3} - \frac{y}{4} - \frac{z}{8} = 28$
9) $\frac{x}{3} - \frac{y}{5} - \frac{z}{4} = 36$
10) $\frac{x}{3} - \frac{y}{8} = -18$
11) $\frac{x}{7} - \frac{y}{5} - \frac{z}{2} = 12$
12) $\frac{x}{7} - 3y + 3z = 24$
13) $\frac{x}{3} - \frac{y}{8} - \frac{z}{5} = 50$
14) $\frac{x}{3} - 2y + 3z = 30$
15) $\frac{x}{3} - \frac{y}{7} - \frac{z}{5} = -14$
16) $\frac{x}{8} - \frac{y}{7} - \frac{z}{12} = 236$
```