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20-0.75s+0.55s=10
We move all terms to the left:
20-0.75s+0.55s-(10)=0
We add all the numbers together, and all the variables
-0.2s+10=0
We move all terms containing s to the left, all other terms to the right
-0.2s=-10
s=-10/-0.2
s=+50
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