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z+4(2z+3)=39
We move all terms to the left:
z+4(2z+3)-(39)=0
We multiply parentheses
z+8z+12-39=0
We add all the numbers together, and all the variables
9z-27=0
We move all terms containing z to the left, all other terms to the right
9z=27
z=27/9
z=3
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