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25(1+2+3+4-4-3-2-1)=s
We move all terms to the left:
25(1+2+3+4-4-3-2-1)-(s)=0
We add all the numbers together, and all the variables
-s+250=0
We add all the numbers together, and all the variables
-1s+250=0
We move all terms containing s to the left, all other terms to the right
-s=-250
s=-250/-1
s=+250
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