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-9+12s=19+16s-2s
We move all terms to the left:
-9+12s-(19+16s-2s)=0
We add all the numbers together, and all the variables
12s-(14s+19)-9=0
We get rid of parentheses
12s-14s-19-9=0
We add all the numbers together, and all the variables
-2s-28=0
We move all terms containing s to the left, all other terms to the right
-2s=28
s=28/-2
s=-14
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