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16=31-3s
We move all terms to the left:
16-(31-3s)=0
We add all the numbers together, and all the variables
-(-3s+31)+16=0
We get rid of parentheses
3s-31+16=0
We add all the numbers together, and all the variables
3s-15=0
We move all terms containing s to the left, all other terms to the right
3s=15
s=15/3
s=5
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