\left\{ \begin{array} { l } { x ^ { 2 } + y ^ { 2 } + z ^ { 2 } = 9 \times 42 } \\ { - x + 3 y = 48 } \\ { y + 2 z = 39 } \end{array} \right.
Solve for x, y, z
x=-3
y=15
z=12
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