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76.9=s+12.9
We move all terms to the left:
76.9-(s+12.9)=0
We get rid of parentheses
-s-12.9+76.9=0
We add all the numbers together, and all the variables
-1s+64=0
We move all terms containing s to the left, all other terms to the right
-s=-64
s=-64/-1
s=+64
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