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(D)=9D+210/8D+13
We move all terms to the left:
(D)-(9D+210/8D+13)=0
Domain of the equation: 8D+13)!=0We get rid of parentheses
D∈R
D-9D-210/8D-13=0
We multiply all the terms by the denominator
D*8D-9D*8D-13*8D-210=0
Wy multiply elements
8D^2-72D^2-104D-210=0
We add all the numbers together, and all the variables
-64D^2-104D-210=0
a = -64; b = -104; c = -210;
Δ = b2-4ac
Δ = -1042-4·(-64)·(-210)
Δ = -42944
Delta is less than zero, so there is no solution for the equation
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