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z/3-9=12
We move all terms to the left:
z/3-9-(12)=0
We add all the numbers together, and all the variables
z/3-21=0
We multiply all the terms by the denominator
z-21*3=0
We add all the numbers together, and all the variables
z-63=0
We move all terms containing z to the left, all other terms to the right
z=63
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