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125=145+87+173+s
We move all terms to the left:
125-(145+87+173+s)=0
We add all the numbers together, and all the variables
-(s+405)+125=0
We get rid of parentheses
-s-405+125=0
We add all the numbers together, and all the variables
-1s-280=0
We move all terms containing s to the left, all other terms to the right
-s=280
s=280/-1
s=-280
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