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10.5d=4d-1
We move all terms to the left:
10.5d-(4d-1)=0
We get rid of parentheses
10.5d-4d+1=0
We add all the numbers together, and all the variables
6.5d+1=0
We move all terms containing d to the left, all other terms to the right
6.5d=-1
d=-1/6.5
d=-1/6.5
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