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20(9-d)+8d=240
We move all terms to the left:
20(9-d)+8d-(240)=0
We add all the numbers together, and all the variables
20(-1d+9)+8d-240=0
We add all the numbers together, and all the variables
8d+20(-1d+9)-240=0
We multiply parentheses
8d-20d+180-240=0
We add all the numbers together, and all the variables
-12d-60=0
We move all terms containing d to the left, all other terms to the right
-12d=60
d=60/-12
d=-5
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