3s+s+2s-6=12

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Solution for 3s+s+2s-6=12 equation: 



3s+s+2s-6=12

We move all terms to the left:

3s+s+2s-6-(12)=0

We add all the numbers together, and all the variables

6s-18=0

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

6s=18

s=18/6

s=3

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