Simplify Complex Rational Expressions
- $$\begin{array} { r } 12 x + 7 y - 8 z + w = 1 \\5 y + z = - 6 \\x - y - 2 z = - 5 \\3 x - 3 y + 4 z = 5\end{array}$$

Multiple Choice

Simplify Complex Rational Expressions
- $$\begin{array} { r } 12 x + 7 y - 8 z + w = 1 \\5 y + z = - 6 \\x - y - 2 z = - 5 \\3 x - 3 y + 4 z = 5\end{array}$$

A)
$$\left[ \begin{array} { l r r r | r } 12 & 7 & - 8 & 1 & 1 \\0 & 5 & 1 & 0 & - 6 \\1 & - 1 & - 2 & 0 & - 5 \\3 & - 3 & 4 & 0 & 5\end{array} \right]$$
B)
$$\left[ \begin{array} { l r r | r } 12 & 7 & - 8 & 1 \\0 & 5 & 1 & 6 \\1 & - 1 & - 2 & - 5 \\3 & - 3 & 4 & 5\end{array} \right]$$
C)
$$\left[ \begin{array} { l r r | r } 12 & 0 & 1 & 9 \\7 & 5 & - 1 & - 3 \\- 8 & 1 & - 2 & 4 \\1 & 0 & 0 & 0 \\1 & - 6 & - 5 & 5\end{array} \right]$$
D)
$$\left[ \begin{array} { l l l l | r } 12 & 7 & 8 & 1 & 1 \\0 & 5 & 1 & 0 & - 6 \\1 & 1 & 2 & 0 & - 5 \\3 & 3 & 4 & 0 & 5\end{array} \right]$$