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