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12(2d-4)=42
We move all terms to the left:
12(2d-4)-(42)=0
We multiply parentheses
24d-48-42=0
We add all the numbers together, and all the variables
24d-90=0
We move all terms containing d to the left, all other terms to the right
24d=90
d=90/24
d=3+3/4
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