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3s-20=s-10+s-10=180
We move all terms to the left:
3s-20-(s-10+s-10)=0
We add all the numbers together, and all the variables
3s-(2s-20)-20=0
We get rid of parentheses
3s-2s+20-20=0
We add all the numbers together, and all the variables
s=0
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