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32=20+z
We move all terms to the left:
32-(20+z)=0
We add all the numbers together, and all the variables
-(z+20)+32=0
We get rid of parentheses
-z-20+32=0
We add all the numbers together, and all the variables
-1z+12=0
We move all terms containing z to the left, all other terms to the right
-z=-12
z=-12/-1
z=+12
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