If the System Has Infinitely Many Solutions, Write the Solution $$\begin{array} { l } 5 x - y + z = 8 \\7 x + y + z = 6 \\12 x + 2 z = 14\end{array}$$

Multiple Choice

If the system has infinitely many solutions, write the solution set with x arbitrary.
- $$\begin{array} { l } 5 x - y + z = 8 \\7 x + y + z = 6 \\12 x + 2 z = 14\end{array}$$

A) $\{ ( x , - x + 1,6 x - 7 ) \}$
B) $\{ ( x , - x - 1 , - 6 x + 7 ) \}$
C) $\{ ( x , - x + 1,6 x + 7 ) \}$
D) $\{ ( x , - x + 1 , - 6 x + 7 ) \}$