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40d=60+(20d)
We move all terms to the left:
40d-(60+(20d))=0
We add all the numbers together, and all the variables
40d-(20d+60)=0
We get rid of parentheses
40d-20d-60=0
We add all the numbers together, and all the variables
20d-60=0
We move all terms containing d to the left, all other terms to the right
20d=60
d=60/20
d=3
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