Express $\frac{3x}{3}$3x3 in simplest form.

Simplify the expression $\frac{20n}{5}$20n5.

Simplify the expression $\frac{8m}{32}$8m32.

Express $\frac{8x}{16}$8x16 in simplest form:

Generalise the properties of operations with fractional numbers and integers.