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2.8=0.4s
We move all terms to the left:
2.8-(0.4s)=0
We add all the numbers together, and all the variables
-(+0.4s)+2.8=0
We get rid of parentheses
-0.4s+2.8=0
We move all terms containing s to the left, all other terms to the right
-0.4s=-2.8
s=-2.8/-0.4
s=6+0.4/0.4
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