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2(2d+3)=30
We move all terms to the left:
2(2d+3)-(30)=0
We multiply parentheses
4d+6-30=0
We add all the numbers together, and all the variables
4d-24=0
We move all terms containing d to the left, all other terms to the right
4d=24
d=24/4
d=6
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