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4(3z-2)=40
We move all terms to the left:
4(3z-2)-(40)=0
We multiply parentheses
12z-8-40=0
We add all the numbers together, and all the variables
12z-48=0
We move all terms containing z to the left, all other terms to the right
12z=48
z=48/12
z=4
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