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z/1+5=21
We move all terms to the left:
z/1+5-(21)=0
We add all the numbers together, and all the variables
z/1-16=0
We multiply all the terms by the denominator
z-16*1=0
We add all the numbers together, and all the variables
z-16=0
We move all terms containing z to the left, all other terms to the right
z=16
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