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3(4d-6)=90
We move all terms to the left:
3(4d-6)-(90)=0
We multiply parentheses
12d-18-90=0
We add all the numbers together, and all the variables
12d-108=0
We move all terms containing d to the left, all other terms to the right
12d=108
d=108/12
d=9
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