Explanation

$\begin{bmatrix} 7 & 3 \\ x & x \end{bmatrix}$ = $24$

$7x - 3x = 24$

$4x = 24$

$x = \frac{24}{4}$ $= 6$

$\begin{bmatrix} 7 & 3 \\ x & x \end{bmatrix}$ = $24$

$7x - 3x = 24$

$4x = 24$

$x = \frac{24}{4}$ $= 6$