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z+0.05z=850
We move all terms to the left:
z+0.05z-(850)=0
We add all the numbers together, and all the variables
1.05z-850=0
We move all terms containing z to the left, all other terms to the right
1.05z=850
z=850/1.05
z=809+0.54999999999995/1.05
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