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12690=s*2538
We move all terms to the left:
12690-(s*2538)=0
We add all the numbers together, and all the variables
-(+s*2538)+12690=0
We get rid of parentheses
-s*2538+12690=0
Wy multiply elements
-2538s+12690=0
We move all terms containing s to the left, all other terms to the right
-2538s=-12690
s=-12690/-2538
s=+5
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