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z/6+72=81
We move all terms to the left:
z/6+72-(81)=0
We add all the numbers together, and all the variables
z/6-9=0
We multiply all the terms by the denominator
z-9*6=0
We add all the numbers together, and all the variables
z-54=0
We move all terms containing z to the left, all other terms to the right
z=54
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