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2(z-1)=3
We move all terms to the left:
2(z-1)-(3)=0
We multiply parentheses
2z-2-3=0
We add all the numbers together, and all the variables
2z-5=0
We move all terms containing z to the left, all other terms to the right
2z=5
z=5/2
z=2+1/2
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