[tex] \frac{7}{14} = \frac{5}{x} = > x = \frac{14 \times 5}{7} = 10[/tex]
[tex] \frac{8}{8} = \frac{10}{x} = > x = \frac{8 \times 10}{8} = 10[/tex]
[tex] \frac{2}{3} = \frac{x}{15} = > x = \frac{2 \times 15}{3} = 10[/tex]
[tex] \frac{3}{6} = \frac{8}{x} = > x = \frac{6 \times 8}{3} = 16[/tex]