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49=131-s
We move all terms to the left:
49-(131-s)=0
We add all the numbers together, and all the variables
-(-1s+131)+49=0
We get rid of parentheses
1s-131+49=0
We add all the numbers together, and all the variables
s-82=0
We move all terms containing s to the left, all other terms to the right
s=82
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