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15(9d+6d)=20
We move all terms to the left:
15(9d+6d)-(20)=0
We add all the numbers together, and all the variables
15(+15d)-20=0
We multiply parentheses
225d-20=0
We move all terms containing d to the left, all other terms to the right
225d=20
d=20/225
d=4/45
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