How to solve unknown variables in matrix using MatLab

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BiNa2605

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I have 4 unknow variables x, y, z and r1. How can I solve the matrix like that

[x, y, z, r1]=solve('(x+e)^2+y^2+z^2-a*(r1^2) =0','(x-e)^2+y^2+z^2-b*(r1^2) =0','x^2+(y-e)^2+z^2-c*(r1^2) =0','x^2+y^2+z^2-d*(r1^2) =0')

My results are different compare to the solution. Can anyone give me explanation?
 

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