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2(1+8d)=15
We move all terms to the left:
2(1+8d)-(15)=0
We add all the numbers together, and all the variables
2(8d+1)-15=0
We multiply parentheses
16d+2-15=0
We add all the numbers together, and all the variables
16d-13=0
We move all terms containing d to the left, all other terms to the right
16d=13
d=13/16
d=13/16
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