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+25=13+2S
We move all terms to the left:
+25-(13+2S)=0
We add all the numbers together, and all the variables
-(2S+13)+25=0
We get rid of parentheses
-2S-13+25=0
We add all the numbers together, and all the variables
-2S+12=0
We move all terms containing S to the left, all other terms to the right
-2S=-12
S=-12/-2
S=+6
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