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-9.76d-(-12.81d)=8.54d=
We move all terms to the left:
-9.76d-(-12.81d)-(8.54d)=0
We add all the numbers together, and all the variables
-9.76d-(-12.81d)-(+8.54d)=0
We get rid of parentheses
-9.76d+12.81d-8.54d=0
We add all the numbers together, and all the variables
-5.49d=0
d=0/-5.49
d=0
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