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13d+6=8.50d+9
We move all terms to the left:
13d+6-(8.50d+9)=0
We get rid of parentheses
13d-8.50d-9+6=0
We add all the numbers together, and all the variables
4.5d-3=0
We move all terms containing d to the left, all other terms to the right
4.5d=3
d=3/4.5
d=3/4.5
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