21s+12=999

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Solution for 21s+12=999 equation: 



21s+12=999

We move all terms to the left:

21s+12-(999)=0

We add all the numbers together, and all the variables

21s-987=0

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

21s=987

s=987/21

s=47

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