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.5(6z-12)=30
We move all terms to the left:
.5(6z-12)-(30)=0
We multiply parentheses
3z-6-30=0
We add all the numbers together, and all the variables
3z-36=0
We move all terms containing z to the left, all other terms to the right
3z=36
z=36/3
z=12
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