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2(4d+7)=30
We move all terms to the left:
2(4d+7)-(30)=0
We multiply parentheses
8d+14-30=0
We add all the numbers together, and all the variables
8d-16=0
We move all terms containing d to the left, all other terms to the right
8d=16
d=16/8
d=2
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