21=14+s

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Solution for 21=14+s equation: 



21=14+s

We move all terms to the left:

21-(14+s)=0

We add all the numbers together, and all the variables

-(s+14)+21=0

We get rid of parentheses

-s-14+21=0

We add all the numbers together, and all the variables

-1s+7=0

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

-s=-7

s=-7/-1

s=+7

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