3s+7s=30

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Solution for 3s+7s=30 equation: 



3s+7s=30

We move all terms to the left:

3s+7s-(30)=0

We add all the numbers together, and all the variables

10s-30=0

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

10s=30

s=30/10

s=3

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