\left\{ \begin{array} { l } { x + m = 3 } \\ { y - 6 = m } \\ { x + y = 9 } \end{array} \right.
Solve for x, m, y (complex solution)
x=9-y
y\in \mathrm{C}
m=y-6
Solve for x, m, y
x=9-y
y\in \mathrm{R}
m=y-6
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