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5.1d-4=6.2
We move all terms to the left:
5.1d-4-(6.2)=0
We add all the numbers together, and all the variables
5.1d-10.2=0
We move all terms containing d to the left, all other terms to the right
5.1d=10.2
d=10.2/5.1
d=2
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