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19-s=3s-13-12
We move all terms to the left:
19-s-(3s-13-12)=0
We add all the numbers together, and all the variables
-s-(3s-25)+19=0
We add all the numbers together, and all the variables
-1s-(3s-25)+19=0
We get rid of parentheses
-1s-3s+25+19=0
We add all the numbers together, and all the variables
-4s+44=0
We move all terms containing s to the left, all other terms to the right
-4s=-44
s=-44/-4
s=+11
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