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9d+1=d-15
We move all terms to the left:
9d+1-(d-15)=0
We get rid of parentheses
9d-d+15+1=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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