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10=0.4s+3
We move all terms to the left:
10-(0.4s+3)=0
We get rid of parentheses
-0.4s-3+10=0
We add all the numbers together, and all the variables
-0.4s+7=0
We move all terms containing s to the left, all other terms to the right
-0.4s=-7
s=-7/-0.4
s=17+0.2/0.4
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