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s/5+21=161
We move all terms to the left:
s/5+21-(161)=0
We add all the numbers together, and all the variables
s/5-140=0
We multiply all the terms by the denominator
s-140*5=0
We add all the numbers together, and all the variables
s-700=0
We move all terms containing s to the left, all other terms to the right
s=700
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