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10d+25(d+8)=280
We move all terms to the left:
10d+25(d+8)-(280)=0
We multiply parentheses
10d+25d+200-280=0
We add all the numbers together, and all the variables
35d-80=0
We move all terms containing d to the left, all other terms to the right
35d=80
d=80/35
d=2+2/7
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