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z=0.25z^-1+0.5z^-2+0.75z^-3
We move all terms to the left:
z-(0.25z^-1+0.5z^-2+0.75z^-3)=0
We get rid of parentheses
z-0.25z^-0.5z^-0.75z^+1+2+3=0
We add all the numbers together, and all the variables
-0.5z+6=0
We move all terms containing z to the left, all other terms to the right
-0.5z=-6
z=-6/-0.5
z=+12
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