s=12-3s

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Solution for s=12-3s equation: 



s=12-3s

We move all terms to the left:

s-(12-3s)=0

We add all the numbers together, and all the variables

s-(-3s+12)=0

We get rid of parentheses

s+3s-12=0

We add all the numbers together, and all the variables

4s-12=0

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

4s=12

s=12/4

s=3

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