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4z-z=24+5*12
We move all terms to the left:
4z-z-(24+5*12)=0
We add all the numbers together, and all the variables
4z-z-84=0
We add all the numbers together, and all the variables
3z-84=0
We move all terms containing z to the left, all other terms to the right
3z=84
z=84/3
z=28
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