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z+3(2z+3)=15
We move all terms to the left:
z+3(2z+3)-(15)=0
We multiply parentheses
z+6z+9-15=0
We add all the numbers together, and all the variables
7z-6=0
We move all terms containing z to the left, all other terms to the right
7z=6
z=6/7
z=6/7
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