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428=s+-218
We move all terms to the left:
428-(s+-218)=0
We add all the numbers together, and all the variables
-(s-218)+428=0
We get rid of parentheses
-s+218+428=0
We add all the numbers together, and all the variables
-1s+646=0
We move all terms containing s to the left, all other terms to the right
-s=-646
s=-646/-1
s=+646
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