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+2-(2S-1)=23
We move all terms to the left:
+2-(2S-1)-(23)=0
We add all the numbers together, and all the variables
-(2S-1)-21=0
We get rid of parentheses
-2S+1-21=0
We add all the numbers together, and all the variables
-2S-20=0
We move all terms containing S to the left, all other terms to the right
-2S=20
S=20/-2
S=-10
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