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11.30+0.85s=30
We move all terms to the left:
11.30+0.85s-(30)=0
We add all the numbers together, and all the variables
0.85s-18.7=0
We move all terms containing s to the left, all other terms to the right
0.85s=18.7
s=18.7/0.85
s=22
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