7=-21+s

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Solution for 7=-21+s equation: 



7=-21+s

We move all terms to the left:

7-(-21+s)=0

We add all the numbers together, and all the variables

-(s-21)+7=0

We get rid of parentheses

-s+21+7=0

We add all the numbers together, and all the variables

-1s+28=0

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

-s=-28

s=-28/-1

s=+28

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