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3(2z+8)=15
We move all terms to the left:
3(2z+8)-(15)=0
We multiply parentheses
6z+24-15=0
We add all the numbers together, and all the variables
6z+9=0
We move all terms containing z to the left, all other terms to the right
6z=-9
z=-9/6
z=-1+1/2
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