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6=2s.9
We move all terms to the left:
6-(2s.9)=0
We add all the numbers together, and all the variables
-(+2s.9)+6=0
We get rid of parentheses
-2s.9+6=0
We move all terms containing s to the left, all other terms to the right
-2s.9=-6
s=-6/1
s=-6
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