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9z-51=4z-9
We move all terms to the left:
9z-51-(4z-9)=0
We get rid of parentheses
9z-4z+9-51=0
We add all the numbers together, and all the variables
5z-42=0
We move all terms containing z to the left, all other terms to the right
5z=42
z=42/5
z=8+2/5
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