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2(z-4)=9
We move all terms to the left:
2(z-4)-(9)=0
We multiply parentheses
2z-8-9=0
We add all the numbers together, and all the variables
2z-17=0
We move all terms containing z to the left, all other terms to the right
2z=17
z=17/2
z=8+1/2
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