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3(2z-10)=30
We move all terms to the left:
3(2z-10)-(30)=0
We multiply parentheses
6z-30-30=0
We add all the numbers together, and all the variables
6z-60=0
We move all terms containing z to the left, all other terms to the right
6z=60
z=60/6
z=10
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