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z/3+9=2
We move all terms to the left:
z/3+9-(2)=0
We add all the numbers together, and all the variables
z/3+7=0
We multiply all the terms by the denominator
z+7*3=0
We add all the numbers together, and all the variables
z+21=0
We move all terms containing z to the left, all other terms to the right
z=-21
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