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D( R )
R-2 = 0
R-2 = 0
R-2 = 0
R-2 = 0 // + 2
R = 2
R in (-oo:2) U (2:+oo)
1/(R-2)+1/4 = 1/5 // - 1/5
1/(R-2)+1/4-(1/5) = 0
1/(R-2)+1/4-1/5 = 0
(1*4*5)/(4*5*(R-2))+(1*5*(R-2))/(4*5*(R-2))+(-1*4*(R-2))/(4*5*(R-2)) = 0
1*5*(R-2)-1*4*(R-2)+1*4*5 = 0
5*R-4*R+8+10 = 0
R+18 = 0
(R+18)/(4*5*(R-2)) = 0
(R+18)/(4*5*(R-2)) = 0 // * 4*5*(R-2)
R+18 = 0
R+18 = 0 // - 18
R = -18
R = -18
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