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5z+3(3z-8)=12+18
We move all terms to the left:
5z+3(3z-8)-(12+18)=0
We add all the numbers together, and all the variables
5z+3(3z-8)-30=0
We multiply parentheses
5z+9z-24-30=0
We add all the numbers together, and all the variables
14z-54=0
We move all terms containing z to the left, all other terms to the right
14z=54
z=54/14
z=3+6/7
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