-9=2s-1

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Solution for -9=2s-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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