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3(4z-1)-3(z+5)=7(z=+1)
We move all terms to the left:
3(4z-1)-3(z+5)-(7(z)=0
We multiply parentheses
12z-3z-(7z-3-15=0
We add all the numbers together, and all the variables
9z-(7z-3-15=0
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