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10=0.4s+2
We move all terms to the left:
10-(0.4s+2)=0
We get rid of parentheses
-0.4s-2+10=0
We add all the numbers together, and all the variables
-0.4s+8=0
We move all terms containing s to the left, all other terms to the right
-0.4s=-8
s=-8/-0.4
s=+20
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