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8.2s+4-13.7=-2
We move all terms to the left:
8.2s+4-13.7-(-2)=0
We add all the numbers together, and all the variables
8.2s-7.7=0
We move all terms containing s to the left, all other terms to the right
8.2s=7.7
s=7.7/8.2
s=4.5294117647059/4.8235294117647
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