3s+9=7+s

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



3s+9=7+s

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

3s-s-7+9=0

We add all the numbers together, and all the variables

2s+2=0

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

2s=-2

s=-2/2

s=-1

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