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12-s=3s-4
We move all terms to the left:
12-s-(3s-4)=0
We add all the numbers together, and all the variables
-1s-(3s-4)+12=0
We get rid of parentheses
-1s-3s+4+12=0
We add all the numbers together, and all the variables
-4s+16=0
We move all terms containing s to the left, all other terms to the right
-4s=-16
s=-16/-4
s=+4
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