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D( r )
r = 0
5*r = 0
r = 0
r = 0
5*r = 0
5*r = 0
5*r = 0 // : 5
r = 0
r in (-oo:0) U (0:+oo)
(r+2)/r = (3*r-6)/r+2/(5*r) // - (3*r-6)/r+2/(5*r)
(r+2)/r-((3*r-6)/r)-(2/(5*r)) = 0
(r+2)/r-((3*r-6)/r)+(-2/5)*r^-1 = 0
(r+2)/r+(-1*(3*r-6))/r-2/(5*r) = 0
(5*r*(r+2))/(5*r*r)+(-1*5*r*(3*r-6))/(5*r*r)+(-2*r)/(5*r*r) = 0
5*r*(r+2)-1*5*r*(3*r-6)-2*r = 0
40*r-10*r^2-2*r = 0
38*r-10*r^2 = 0
38*r-10*r^2 = 0
2*r*(19-5*r) = 0
19-5*r = 0 // - 19
-5*r = -19 // : -5
r = -19/(-5)
r = 19/5
2*r*(r-19/5) = 0
(2*r*(r-19/5))/(5*r*r) = 0
(2*r*(r-19/5))/(5*r*r) = 0 // * 5*r*r
2*r*(r-19/5) = 0
( 2*r )
2*r = 0 // : 2
r = 0
( r-19/5 )
r-19/5 = 0 // + 19/5
r = 19/5
r in { 0}
r = 19/5
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