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-2.1s=-6.8s-13.63
We move all terms to the left:
-2.1s-(-6.8s-13.63)=0
We get rid of parentheses
-2.1s+6.8s+13.63=0
We add all the numbers together, and all the variables
4.7s+13.63=0
We move all terms containing s to the left, all other terms to the right
4.7s=-13.63
s=-13.63/4.7
s=-2+1/1.1111111111111
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