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6.1d-74.3-2d=11.8
We move all terms to the left:
6.1d-74.3-2d-(11.8)=0
We add all the numbers together, and all the variables
4.1d-86.1=0
We move all terms containing d to the left, all other terms to the right
4.1d=86.1
d=86.1/4.1
d=21
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