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z/3-3=30
We move all terms to the left:
z/3-3-(30)=0
We add all the numbers together, and all the variables
z/3-33=0
We multiply all the terms by the denominator
z-33*3=0
We add all the numbers together, and all the variables
z-99=0
We move all terms containing z to the left, all other terms to the right
z=99
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