-3s-7=8+9+s

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Solution for -3s-7=8+9+s equation: 



-3s-7=8+9+s

We move all terms to the left:

-3s-7-(8+9+s)=0

We add all the numbers together, and all the variables

-3s-(s+17)-7=0

We get rid of parentheses

-3s-s-17-7=0

We add all the numbers together, and all the variables

-4s-24=0

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

-4s=24

s=24/-4

s=-6

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