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5s-7=12.4
We move all terms to the left:
5s-7-(12.4)=0
We add all the numbers together, and all the variables
5s-19.4=0
We move all terms containing s to the left, all other terms to the right
5s=19.4
s=19.4/5
s=3+3.14285714286/3.57142857143
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