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7.1d+14.8=64.5
We move all terms to the left:
7.1d+14.8-(64.5)=0
We add all the numbers together, and all the variables
7.1d-49.7=0
We move all terms containing d to the left, all other terms to the right
7.1d=49.7
d=49.7/7.1
d=7+7.105427357601E-15/7.1
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