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647=s+-211
We move all terms to the left:
647-(s+-211)=0
We add all the numbers together, and all the variables
-(s-211)+647=0
We get rid of parentheses
-s+211+647=0
We add all the numbers together, and all the variables
-1s+858=0
We move all terms containing s to the left, all other terms to the right
-s=-858
s=-858/-1
s=+858
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