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-9.76-(-12.81d)=8.54
We move all terms to the left:
-9.76-(-12.81d)-(8.54)=0
We add all the numbers together, and all the variables
-(-12.81d)-18.3=0
We get rid of parentheses
12.81d-18.3=0
We move all terms containing d to the left, all other terms to the right
12.81d=18.3
d=18.3/12.81
d=1+3.6845637583893/8.5973154362416
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