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4(d/2-9)=40
We move all terms to the left:
4(d/2-9)-(40)=0
We multiply parentheses
4d-36-40=0
We add all the numbers together, and all the variables
4d-76=0
We move all terms containing d to the left, all other terms to the right
4d=76
d=76/4
d=19
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