Make $x$x the subject of the following equation:

$y=x+z$y=x+z

$y=\frac{x}{4}$y=x4

Solve $D=RT$D=RT for $R$R.

Make $m$m the subject of the following equation:

$\frac{m}{y}=gh$my=gh

Determine the value of a variable in the first degree, using a formula