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D( k )
5*k-3 = 0
5*k-3 = 0
5*k-3 = 0
5*k-3 = 0 // + 3
5*k = 3 // : 5
k = 3/5
k in (-oo:3/5) U (3/5:+oo)
k*(((k*((k+3)/16))/(5*k-3))/12) = 0
(k^2*(k+3))/(12*16*(5*k-3)) = 0
( k+3 )
k+3 = 0 // - 3
k = -3
( k )
k = 0
k in { -3, 0, 0 }
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