2+7s=9

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Solution for 2+7s=9 equation: 



2+7s=9

We move all terms to the left:

2+7s-(9)=0

We add all the numbers together, and all the variables

7s-7=0

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

7s=7

s=7/7

s=1

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