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15d+9=8d+51
We move all terms to the left:
15d+9-(8d+51)=0
We get rid of parentheses
15d-8d-51+9=0
We add all the numbers together, and all the variables
7d-42=0
We move all terms containing d to the left, all other terms to the right
7d=42
d=42/7
d=6
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