Solve the following equation:

$\frac{x}{6}=\frac{5}{3}$x6=53

Solve $\frac{x}{6}=2\frac{2}{3}$x6=223.

Solve $\frac{7.8}{7.5}=\frac{x}{5}$7.87.5=x5.

Solve $\frac{2}{1.1}=\frac{5}{x}$21.1=5x.