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7(z-1)=12
We move all terms to the left:
7(z-1)-(12)=0
We multiply parentheses
7z-7-12=0
We add all the numbers together, and all the variables
7z-19=0
We move all terms containing z to the left, all other terms to the right
7z=19
z=19/7
z=2+5/7
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