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=7/+7D
We move all terms to the left:
-(7/+7D)=0
Domain of the equation: +7D)!=0We add all the numbers together, and all the variables
D!=0/1
D!=0
D∈R
-(+7D+7/)=0
We get rid of parentheses
-7D-7/=0
We multiply all the terms by the denominator
-7D*-7=0
We move all terms containing D to the left, all other terms to the right
-7D*=7
D=7/1
D=7
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