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12d-8d=(12-8)
We move all terms to the left:
12d-8d-((12-8))=0
We add all the numbers together, and all the variables
12d-8d-(4)=0
We add all the numbers together, and all the variables
4d-4=0
We move all terms containing d to the left, all other terms to the right
4d=4
d=4/4
d=1
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