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13d-6=4d-15
We move all terms to the left:
13d-6-(4d-15)=0
We get rid of parentheses
13d-4d+15-6=0
We add all the numbers together, and all the variables
9d+9=0
We move all terms containing d to the left, all other terms to the right
9d=-9
d=-9/9
d=-1
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