9=2*s+1

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Solution for 9=2*s+1 equation: 



9=2s+1

We move all terms to the left:

9-(2s+1)=0

We get rid of parentheses

-2s-1+9=0

We add all the numbers together, and all the variables

-2s+8=0

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

-2s=-8

s=-8/-2

s=+4

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