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6.13+2.46-s=3.99
We move all terms to the left:
6.13+2.46-s-(3.99)=0
We add all the numbers together, and all the variables
-1s+4.6=0
We move all terms containing s to the left, all other terms to the right
-s=-4.6
s=-4.6/-1
s=4+0.6/1
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