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(D)=6D+210/12D+15
We move all terms to the left:
(D)-(6D+210/12D+15)=0
Domain of the equation: 12D+15)!=0We get rid of parentheses
D∈R
D-6D-210/12D-15=0
We multiply all the terms by the denominator
D*12D-6D*12D-15*12D-210=0
Wy multiply elements
12D^2-72D^2-180D-210=0
We add all the numbers together, and all the variables
-60D^2-180D-210=0
a = -60; b = -180; c = -210;
Δ = b2-4ac
Δ = -1802-4·(-60)·(-210)
Δ = -18000
Delta is less than zero, so there is no solution for the equation
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