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20+13d=5d+6+9d
We move all terms to the left:
20+13d-(5d+6+9d)=0
We add all the numbers together, and all the variables
13d-(14d+6)+20=0
We get rid of parentheses
13d-14d-6+20=0
We add all the numbers together, and all the variables
-1d+14=0
We move all terms containing d to the left, all other terms to the right
-d=-14
d=-14/-1
d=+14
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