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D( k )
3*k-5 = 0
3*k-5 = 0
3*k-5 = 0
3*k-5 = 0 // + 5
3*k = 5 // : 3
k = 5/3
k in (-oo:5/3) U (5/3:+oo)
-(9/(3*k-5))-3*k = 1/6 // - 1/6
-(9/(3*k-5))-3*k-(1/6) = 0
-9*(3*k-5)^-1-3*k-1/6 = 0
-9/(3*k-5)-3*k-1/6 = 0
(-9*6)/(6*(3*k-5))+(-3*6*k*(3*k-5))/(6*(3*k-5))+(-1*(3*k-5))/(6*(3*k-5)) = 0
-3*6*k*(3*k-5)-1*(3*k-5)-9*6 = 0
90*k-54*k^2-3*k-54+5 = 0
87*k-54*k^2-49 = 0
87*k-54*k^2-49 = 0
87*k-54*k^2-49 = 0
DELTA = 87^2-(-54*(-49)*4)
DELTA = -3015
DELTA < 0
1 = 0
1/(6*(3*k-5)) = 0
1/(6*(3*k-5)) = 0 // * 6*(3*k-5)
1 = 0
k belongs to the empty set
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