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6(2z-5)=30
We move all terms to the left:
6(2z-5)-(30)=0
We multiply parentheses
12z-30-30=0
We add all the numbers together, and all the variables
12z-60=0
We move all terms containing z to the left, all other terms to the right
12z=60
z=60/12
z=5
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