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9+8(1+6d)=31
We move all terms to the left:
9+8(1+6d)-(31)=0
We add all the numbers together, and all the variables
8(6d+1)+9-31=0
We add all the numbers together, and all the variables
8(6d+1)-22=0
We multiply parentheses
48d+8-22=0
We add all the numbers together, and all the variables
48d-14=0
We move all terms containing d to the left, all other terms to the right
48d=14
d=14/48
d=7/24
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