-7+8s-4s=9

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Solution for -7+8s-4s=9 equation: 



-7+8s-4s=9

We move all terms to the left:

-7+8s-4s-(9)=0

We add all the numbers together, and all the variables

4s-16=0

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

4s=16

s=16/4

s=4

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