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s/7+21=23
We move all terms to the left:
s/7+21-(23)=0
We add all the numbers together, and all the variables
s/7-2=0
We multiply all the terms by the denominator
s-2*7=0
We add all the numbers together, and all the variables
s-14=0
We move all terms containing s to the left, all other terms to the right
s=14
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