Solve for a_3, a_5, d
a_{3}=2\text{, }a_{5}=1\text{, }d=\frac{1}{2}=0.5
a_{3}=\sqrt{2-4d}+2\text{, }a_{5}=-2d+\sqrt{2-4d}+2\text{, }d\leq \frac{1}{2}
a_{3}=-\sqrt{2-4d}+2\text{, }a_{5}=-2d-\sqrt{2-4d}+2\text{, }d\leq \frac{1}{2}
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