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z/8-3=12.8
We move all terms to the left:
z/8-3-(12.8)=0
We add all the numbers together, and all the variables
z/8-15.8=0
We multiply all the terms by the denominator
z-(15.8)*8=0
We add all the numbers together, and all the variables
z-126.4=0
We move all terms containing z to the left, all other terms to the right
z=126.4
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