Solve the equation
![4 {x}^{4} - 28 {x}^{3} + 51 {x}^{2} - 7x - 20 = 0 4 {x}^{4} - 28 {x}^{3} + 51 {x}^{2} - 7x - 20 = 0](https://tex.z-dn.net/?f=4+%7Bx%7D%5E%7B4%7D++-+28+%7Bx%7D%5E%7B3%7D++%2B+51+%7Bx%7D%5E%7B2%7D+++-+7x+-+20+%3D+0)
whose roots are in A.P.
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