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2.1d=6.3
We move all terms to the left:
2.1d-(6.3)=0
We add all the numbers together, and all the variables
2.1d-6.3=0
We move all terms containing d to the left, all other terms to the right
2.1d=6.3
d=6.3/2.1
d=3+-8.8817841970013E-16/2.1
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