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8-4s=8+13
We move all terms to the left:
8-4s-(8+13)=0
We add all the numbers together, and all the variables
-4s+8-21=0
We add all the numbers together, and all the variables
-4s-13=0
We move all terms containing s to the left, all other terms to the right
-4s=13
s=13/-4
s=-3+1/4
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