Solve for u, v
u=\frac{\sqrt{21}+9}{2}\approx 6.791287847\text{, }v=-\frac{\sqrt{21}}{3}+3\approx 1.472474768
u=\frac{9-\sqrt{21}}{2}\approx 2.208712153\text{, }v=\frac{\sqrt{21}}{3}+3\approx 4.527525232
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