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-9.7d-(-12.81d)=8.54
We move all terms to the left:
-9.7d-(-12.81d)-(8.54)=0
We add all the numbers together, and all the variables
-9.7d-(-12.81d)-8.54=0
We get rid of parentheses
-9.7d+12.81d-8.54=0
We add all the numbers together, and all the variables
3.11d-8.54=0
We move all terms containing d to the left, all other terms to the right
3.11d=8.54
d=8.54/3.11
d=2+2.32/3.11
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