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5d-6=3+12
We move all terms to the left:
5d-6-(3+12)=0
We add all the numbers together, and all the variables
5d-6-15=0
We add all the numbers together, and all the variables
5d-21=0
We move all terms containing d to the left, all other terms to the right
5d=21
d=21/5
d=4+1/5
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