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8d+9=4d+13
We move all terms to the left:
8d+9-(4d+13)=0
We get rid of parentheses
8d-4d-13+9=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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