Find a,b,c given that \(4\begin{bmatrix}
a &2 & 3 \\[0.3em]
4& 5 &-6 \\[0.3em]
7 & -8&9
\end{bmatrix}\) - \(5\begin{bmatrix}
3&2 & 1 \\[0.3em]
b& 6 &-4 \\[0.3em]
9 & -8&7
\end{bmatrix}\) = \(\begin{bmatrix}
13 &-2 & 7 \\[0.3em]
6& -5 &-4 \\[0.3em]
-17 & 2c&1
\end{bmatrix}\)
