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z+4(2z+3)=20
We move all terms to the left:
z+4(2z+3)-(20)=0
We multiply parentheses
z+8z+12-20=0
We add all the numbers together, and all the variables
9z-8=0
We move all terms containing z to the left, all other terms to the right
9z=8
z=8/9
z=8/9
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