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18(d/3-9)=198
We move all terms to the left:
18(d/3-9)-(198)=0
We multiply parentheses
18d-162-198=0
We add all the numbers together, and all the variables
18d-360=0
We move all terms containing d to the left, all other terms to the right
18d=360
d=360/18
d=20
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