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^2=36D-324
We move all terms to the left:
^2-(36D-324)=0
We add all the numbers together, and all the variables
-(36D-324)=0
We get rid of parentheses
-36D+324=0
We move all terms containing D to the left, all other terms to the right
-36D=-324
D=-324/-36
D=+9
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