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4z-9=5z+18
We move all terms to the left:
4z-9-(5z+18)=0
We get rid of parentheses
4z-5z-18-9=0
We add all the numbers together, and all the variables
-1z-27=0
We move all terms containing z to the left, all other terms to the right
-z=27
z=27/-1
z=-27
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