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12=-8+2s
We move all terms to the left:
12-(-8+2s)=0
We add all the numbers together, and all the variables
-(2s-8)+12=0
We get rid of parentheses
-2s+8+12=0
We add all the numbers together, and all the variables
-2s+20=0
We move all terms containing s to the left, all other terms to the right
-2s=-20
s=-20/-2
s=+10
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