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54=9d+45
We move all terms to the left:
54-(9d+45)=0
We get rid of parentheses
-9d-45+54=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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