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z/3+12=15
We move all terms to the left:
z/3+12-(15)=0
We add all the numbers together, and all the variables
z/3-3=0
We multiply all the terms by the denominator
z-3*3=0
We add all the numbers together, and all the variables
z-9=0
We move all terms containing z to the left, all other terms to the right
z=9
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