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4(2z-3)=12
We move all terms to the left:
4(2z-3)-(12)=0
We multiply parentheses
8z-12-12=0
We add all the numbers together, and all the variables
8z-24=0
We move all terms containing z to the left, all other terms to the right
8z=24
z=24/8
z=3
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