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20+6d=35+d
We move all terms to the left:
20+6d-(35+d)=0
We add all the numbers together, and all the variables
6d-(d+35)+20=0
We get rid of parentheses
6d-d-35+20=0
We add all the numbers together, and all the variables
5d-15=0
We move all terms containing d to the left, all other terms to the right
5d=15
d=15/5
d=3
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