4=s-9

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Solution for 4=s-9 equation: 



4=s-9

We move all terms to the left:

4-(s-9)=0

We get rid of parentheses

-s+9+4=0

We add all the numbers together, and all the variables

-1s+13=0

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

-s=-13

s=-13/-1

s=+13

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