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7d-4d-3d+4d+3d=14
We move all terms to the left:
7d-4d-3d+4d+3d-(14)=0
We add all the numbers together, and all the variables
7d-14=0
We move all terms containing d to the left, all other terms to the right
7d=14
d=14/7
d=2
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