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3(3z-1)-3(3-4z)=18
We move all terms to the left:
3(3z-1)-3(3-4z)-(18)=0
We add all the numbers together, and all the variables
3(3z-1)-3(-4z+3)-18=0
We multiply parentheses
9z+12z-3-9-18=0
We add all the numbers together, and all the variables
21z-30=0
We move all terms containing z to the left, all other terms to the right
21z=30
z=30/21
z=1+3/7
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