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11d-13=7d-11
We move all terms to the left:
11d-13-(7d-11)=0
We get rid of parentheses
11d-7d+11-13=0
We add all the numbers together, and all the variables
4d-2=0
We move all terms containing d to the left, all other terms to the right
4d=2
d=2/4
d=1/2
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