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-45=-5d-4d
We move all terms to the left:
-45-(-5d-4d)=0
We add all the numbers together, and all the variables
-(-9d)-45=0
We get rid of parentheses
9d-45=0
We move all terms containing d to the left, all other terms to the right
9d=45
d=45/9
d=5
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