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4s+21=s+54
We move all terms to the left:
4s+21-(s+54)=0
We get rid of parentheses
4s-s-54+21=0
We add all the numbers together, and all the variables
3s-33=0
We move all terms containing s to the left, all other terms to the right
3s=33
s=33/3
s=11
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