Further help
HOW TO FIND THE INVERSE OF A 3×3 MATRIX (MANUAL APPROACH)
1) Find the determinant https://youtu.be/vkmrQKKbQzY
2) Find the Minors https://youtu.be/_4YS2FBS87o
3) Find the Cofactors https://youtu.be/QyH9fMA2qbU
4) Find the Adjoint Matrix and the Inverse Matrix https://youtu.be/3q7rSaE2nig