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6(2d+3)=30
We move all terms to the left:
6(2d+3)-(30)=0
We multiply parentheses
12d+18-30=0
We add all the numbers together, and all the variables
12d-12=0
We move all terms containing d to the left, all other terms to the right
12d=12
d=12/12
d=1
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