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D( r )
r = 0
r = 0
r = 0
r in (-oo:0) U (0:+oo)
5/r = 14-3 // - 14-3
5/r-14+3 = 0
5*r^-1 = 11 // : 5
r^-1 = 11/5
-1 < 0
1/(r^1) = 11/5 // * r^1
1 = 11/5*r^1 // : 11/5
5/11 = r^1
r = 5/11
r = 5/11
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