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6.4s=-38.4
We move all terms to the left:
6.4s-(-38.4)=0
We add all the numbers together, and all the variables
6.4s+38.4=0
We move all terms containing s to the left, all other terms to the right
6.4s=-38.4
s=-38.4/6.4
s=-5+1/1
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