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12=1+4s
We move all terms to the left:
12-(1+4s)=0
We add all the numbers together, and all the variables
-(4s+1)+12=0
We get rid of parentheses
-4s-1+12=0
We add all the numbers together, and all the variables
-4s+11=0
We move all terms containing s to the left, all other terms to the right
-4s=-11
s=-11/-4
s=2+3/4
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