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6z-20=-4z-20+13z
We move all terms to the left:
6z-20-(-4z-20+13z)=0
We add all the numbers together, and all the variables
6z-(9z-20)-20=0
We get rid of parentheses
6z-9z+20-20=0
We add all the numbers together, and all the variables
-3z=0
z=0/-3
z=0
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