7=3+s

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Solution for 7=3+s equation: 



7=3+s

We move all terms to the left:

7-(3+s)=0

We add all the numbers together, and all the variables

-(s+3)+7=0

We get rid of parentheses

-s-3+7=0

We add all the numbers together, and all the variables

-1s+4=0

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

-s=-4

s=-4/-1

s=+4

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