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9z-15=9-3
We move all terms to the left:
9z-15-(9-3)=0
We add all the numbers together, and all the variables
9z-15-6=0
We add all the numbers together, and all the variables
9z-21=0
We move all terms containing z to the left, all other terms to the right
9z=21
z=21/9
z=2+1/3
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