4s-39=42+7s

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Solution for 4s-39=42+7s equation: 



4s-39=42+7s

We move all terms to the left:

4s-39-(42+7s)=0

We add all the numbers together, and all the variables

4s-(7s+42)-39=0

We get rid of parentheses

4s-7s-42-39=0

We add all the numbers together, and all the variables

-3s-81=0

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

-3s=81

s=81/-3

s=-27

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