My 800 followers problem!

Algebra Level 5

(799(xy)+800(yz)+801(zx)=0638401(xy)+640000(yz)+641601(zx)=800\begin{array}{c}(799(x-y)& +& 800(y-z)& + &801(z-x) & =0 \\ 638401(x-y) & + & 640000(y-z) & +& 641601(z-x) & =800 \end{array}

If x,y,zx,y,z satisfy the above system of equations then find the value of x2y+zx-2y+z.

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