10s+9=-2-s

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Solution for 10s+9=-2-s equation: 



10s+9=-2-s

We move all terms to the left:

10s+9-(-2-s)=0

We add all the numbers together, and all the variables

10s-(-1s-2)+9=0

We get rid of parentheses

10s+1s+2+9=0

We add all the numbers together, and all the variables

11s+11=0

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

11s=-11

s=-11/11

s=-1

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