2s-9=-1

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Solution for 2s-9=-1 equation: 



2s-9=-1

We move all terms to the left:

2s-9-(-1)=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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