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20+6s=-20-3s+4
We move all terms to the left:
20+6s-(-20-3s+4)=0
We add all the numbers together, and all the variables
6s-(-3s-16)+20=0
We get rid of parentheses
6s+3s+16+20=0
We add all the numbers together, and all the variables
9s+36=0
We move all terms containing s to the left, all other terms to the right
9s=-36
s=-36/9
s=-4
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