Question

Subtract:

$5\mathrm{x}$ from $9\mathrm{x}$.

Answer 1

Arrange the variables in proper columns and subtract them,

$9\mathrm{x}-5\mathrm{x}4\mathrm{x}$

Hence, $9\mathrm{x}-4\mathrm{x}=5\mathrm{x}$.