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43d-40d-3+10d-5d=50
We move all terms to the left:
43d-40d-3+10d-5d-(50)=0
We add all the numbers together, and all the variables
8d-53=0
We move all terms containing d to the left, all other terms to the right
8d=53
d=53/8
d=6+5/8
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