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4-12z=20-11z
We move all terms to the left:
4-12z-(20-11z)=0
We add all the numbers together, and all the variables
-12z-(-11z+20)+4=0
We get rid of parentheses
-12z+11z-20+4=0
We add all the numbers together, and all the variables
-1z-16=0
We move all terms containing z to the left, all other terms to the right
-z=16
z=16/-1
z=-16
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