Solve the Matrix Equation [[a,4],[-2,d]][[2],[-4]]=[[-12],[12]]

$[\begin{array}{c} a & 4 \\ - 2 & d \end{array}] [\begin{array}{c} 2 \\ - 4 \end{array}] = [\begin{array}{c} - 12 \\ 12 \end{array}]$

The matrix must be a square matrix to find the inverse.

Inverse matrix cannot be found