Solve for D, b, a, c (complex solution)
D=b^{2}-4ac
b\in \mathrm{C}
a\in \mathrm{C}
c\in \mathrm{C}
Solve for D, b, a, c
D=b^{2}-4ac
b\in \mathrm{R}
a\in \mathrm{R}
c\in \mathrm{R}
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