21s-31=242

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Solution for 21s-31=242 equation: 



21s-31=242

We move all terms to the left:

21s-31-(242)=0

We add all the numbers together, and all the variables

21s-273=0

We move all terms containing s to the left, all other terms to the right

21s=273

s=273/21

s=13

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