3s+15=21

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Solution for 3s+15=21 equation: 



3s+15=21

We move all terms to the left:

3s+15-(21)=0

We add all the numbers together, and all the variables

3s-6=0

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

3s=6

s=6/3

s=2

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