7+21s=13

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Solution for 7+21s=13 equation: 



7+21s=13

We move all terms to the left:

7+21s-(13)=0

We add all the numbers together, and all the variables

21s-6=0

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

21s=6

s=6/21

s=2/7

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