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12(z-7)=6
We move all terms to the left:
12(z-7)-(6)=0
We multiply parentheses
12z-84-6=0
We add all the numbers together, and all the variables
12z-90=0
We move all terms containing z to the left, all other terms to the right
12z=90
z=90/12
z=7+1/2
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