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19-4s+18=-20-7s
We move all terms to the left:
19-4s+18-(-20-7s)=0
We add all the numbers together, and all the variables
-4s-(-7s-20)+19+18=0
We add all the numbers together, and all the variables
-4s-(-7s-20)+37=0
We get rid of parentheses
-4s+7s+20+37=0
We add all the numbers together, and all the variables
3s+57=0
We move all terms containing s to the left, all other terms to the right
3s=-57
s=-57/3
s=-19
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