20s+s-9s=12

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Solution for 20s+s-9s=12 equation: 



20s+s-9s=12

We move all terms to the left:

20s+s-9s-(12)=0

We add all the numbers together, and all the variables

12s-12=0

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

12s=12

s=12/12

s=1

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