12=3+s

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Solution for 12=3+s equation: 



12=3+s

We move all terms to the left:

12-(3+s)=0

We add all the numbers together, and all the variables

-(s+3)+12=0

We get rid of parentheses

-s-3+12=0

We add all the numbers together, and all the variables

-1s+9=0

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

-s=-9

s=-9/-1

s=+9

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