\left\{ \begin{array} { l } { M + N = 2 } \\ { n + C = 3 } \\ { C = 6 } \end{array} \right.
Solve for M, N, n, C (complex solution)
M=2-N
N\in \mathrm{C}
n=-3
C=6
Solve for M, N, n, C
M=2-N
N\in \mathrm{R}
n=-3
C=6
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