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(3s-20)+(2s)+(4s)=180
We move all terms to the left:
(3s-20)+(2s)+(4s)-(180)=0
We add all the numbers together, and all the variables
6s+(3s-20)-180=0
We get rid of parentheses
6s+3s-20-180=0
We add all the numbers together, and all the variables
9s-200=0
We move all terms containing s to the left, all other terms to the right
9s=200
s=200/9
s=22+2/9
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