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20+z/3=43
We move all terms to the left:
20+z/3-(43)=0
We add all the numbers together, and all the variables
z/3-23=0
We multiply all the terms by the denominator
z-23*3=0
We add all the numbers together, and all the variables
z-69=0
We move all terms containing z to the left, all other terms to the right
z=69
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