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3(4d-6)=42
We move all terms to the left:
3(4d-6)-(42)=0
We multiply parentheses
12d-18-42=0
We add all the numbers together, and all the variables
12d-60=0
We move all terms containing d to the left, all other terms to the right
12d=60
d=60/12
d=5
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