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