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4.75s+3=21
We move all terms to the left:
4.75s+3-(21)=0
We add all the numbers together, and all the variables
4.75s-18=0
We move all terms containing s to the left, all other terms to the right
4.75s=18
s=18/4.75
s=3+2.1428571428571/2.7142857142857
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