4s+39=123

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Solution for 4s+39=123 equation: 



4s+39=123

We move all terms to the left:

4s+39-(123)=0

We add all the numbers together, and all the variables

4s-84=0

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

4s=84

s=84/4

s=21

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