Solve for y, x, y_3
x=-\frac{\sqrt{21}}{3}+1\approx -0.527525232\text{, }y=-\frac{4\sqrt{21}}{3}+7\approx 0.889899073\text{, }y_{3}=\frac{482-94\sqrt{21}}{3}\approx 17.079294891
x=\frac{\sqrt{21}}{3}+1\approx 2.527525232\text{, }y=\frac{4\sqrt{21}}{3}+7\approx 13.110100927\text{, }y_{3}=\frac{94\sqrt{21}+482}{3}\approx 304.254038442
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