s+s+s=15

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Solution for s+s+s=15 equation: 



s+s+s=15

We move all terms to the left:

s+s+s-(15)=0

We add all the numbers together, and all the variables

3s-15=0

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

3s=15

s=15/3

s=5

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