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-s+10+2s=-s-8
We move all terms to the left:
-s+10+2s-(-s-8)=0
We add all the numbers together, and all the variables
-s+2s-(-1s-8)+10=0
We add all the numbers together, and all the variables
s-(-1s-8)+10=0
We get rid of parentheses
s+1s+8+10=0
We add all the numbers together, and all the variables
2s+18=0
We move all terms containing s to the left, all other terms to the right
2s=-18
s=-18/2
s=-9
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