3s-9=30

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Solution for 3s-9=30 equation: 



3s-9=30

We move all terms to the left:

3s-9-(30)=0

We add all the numbers together, and all the variables

3s-39=0

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

3s=39

s=39/3

s=13

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