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3(5z+1)=30
We move all terms to the left:
3(5z+1)-(30)=0
We multiply parentheses
15z+3-30=0
We add all the numbers together, and all the variables
15z-27=0
We move all terms containing z to the left, all other terms to the right
15z=27
z=27/15
z=1+4/5
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