Solve 4r-3=3(3r^4)

Solve the equation(The real numbers system)

r \in / R

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r_{1} \approx 0.552869 + 0.323562 i, r_{2} \approx 0.552869 - 0.323562 i, r_{3} \approx - 0.552869 + 0.711784 i, r_{4} \approx - 0.552869 - 0.711784 i

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16 x^{2} + 16 y^{2} = 81 x^{8} + 324 x^{6} y^{2} + 486 x^{4} y^{4} + 54 x^{4} + 324 x^{2} y^{6} + 108 x^{2} y^{2} + 81 y^{8} + 54 y^{4} + 9

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