25s-21+12s=30s

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Solution for 25s-21+12s=30s equation: 



25s-21+12s=30s

We move all terms to the left:

25s-21+12s-(30s)=0

We add all the numbers together, and all the variables

7s-21=0

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

7s=21

s=21/7

s=3

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