3s+1-7s=9

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Solution for 3s+1-7s=9 equation: 



3s+1-7s=9

We move all terms to the left:

3s+1-7s-(9)=0

We add all the numbers together, and all the variables

-4s-8=0

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

-4s=8

s=8/-4

s=-2

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