Solve for a, x, b, y, u (complex solution)
x=0\text{, }y=0\text{, }a=0\text{, }b=0\text{, }u\in \mathrm{C}
x=0\text{, }y=2b\text{, }a=b\text{, }b\in \mathrm{C}\text{, }u=-1
Solve for a, x, b, y, u
x=0\text{, }y=0\text{, }a=0\text{, }b=0\text{, }u\in \mathrm{R}
x=0\text{, }y=2b\text{, }a=b\text{, }b\in \mathrm{R}\text{, }u=-1
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