s+2s+3s=12

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Solution for s+2s+3s=12 equation: 



s+2s+3s=12

We move all terms to the left:

s+2s+3s-(12)=0

We add all the numbers together, and all the variables

6s-12=0

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

6s=12

s=12/6

s=2

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