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-18-20z=-5z+18-18z
We move all terms to the left:
-18-20z-(-5z+18-18z)=0
We add all the numbers together, and all the variables
-20z-(-23z+18)-18=0
We get rid of parentheses
-20z+23z-18-18=0
We add all the numbers together, and all the variables
3z-36=0
We move all terms containing z to the left, all other terms to the right
3z=36
z=36/3
z=12
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