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(^2=-20)D=0
We move all terms to the left:
(^2-(-20)D)=0
We calculate terms in parentheses: +(^2-(-20)D), so:D=0/20
^2-(-20)D
determiningTheFunctionDomain -(-20)D+^2
We add all the numbers together, and all the variables
-(-20)D
We multiply parentheses
20D
Back to the equation:
+(20D)
D=0
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