Solve for x, y, z
x=a+\frac{\sqrt{-4a-7}}{2}-\frac{1}{2}\text{, }y=\frac{-\sqrt{-4a-7}+1}{2}\text{, }z=a
x=a-\frac{\sqrt{-4a-7}}{2}-\frac{1}{2}\text{, }y=\frac{\sqrt{-4a-7}+1}{2}\text{, }z=a\text{, }a\leq -\frac{7}{4}
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