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9=3.1+s
We move all terms to the left:
9-(3.1+s)=0
We add all the numbers together, and all the variables
-(s+3.1)+9=0
We get rid of parentheses
-s-3.1+9=0
We add all the numbers together, and all the variables
-1s+5.9=0
We move all terms containing s to the left, all other terms to the right
-s=-5.9
s=-5.9/-1
s=5+0.9/1
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