Solve for D, A, B, C (complex solution)
D=2A-B+3C
A\in \mathrm{C}
B\in \mathrm{C}
C\in \mathrm{C}
Solve for D, A, B, C
D=2A-B+3C
A\in \mathrm{R}
B\in \mathrm{R}
C\in \mathrm{R}
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