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24=20-2z
We move all terms to the left:
24-(20-2z)=0
We add all the numbers together, and all the variables
-(-2z+20)+24=0
We get rid of parentheses
2z-20+24=0
We add all the numbers together, and all the variables
2z+4=0
We move all terms containing z to the left, all other terms to the right
2z=-4
z=-4/2
z=-2
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