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(S)=20.000-2.000S
We move all terms to the left:
(S)-(20.000-2.000S)=0
We add all the numbers together, and all the variables
S-(-2S+20)=0
We get rid of parentheses
S+2S-20=0
We add all the numbers together, and all the variables
3S-20=0
We move all terms containing S to the left, all other terms to the right
3S=20
S=20/3
S=6+2/3
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