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D( k )
6*k+2 = 0
6*k+2 = 0
6*k+2 = 0
6*k+2 = 0 // - 2
6*k = -2 // : 6
k = -2/6
k = -1/3
k in (-oo:-1/3) U (-1/3:+oo)
(3*k+1)/10+5/(6*k+2) = 0
((3*k+1)*(6*k+2))/(10*(6*k+2))+(5*10)/(10*(6*k+2)) = 0
(3*k+1)*(6*k+2)+5*10 = 0
18*k^2+12*k+52 = 0
18*k^2+12*k+52 = 0
2*(9*k^2+6*k+26) = 0
9*k^2+6*k+26 = 0
DELTA = 6^2-(4*9*26)
DELTA = -900
DELTA < 0
2 = 0
2/(10*(6*k+2)) = 0
2/(10*(6*k+2)) = 0 // * 10*(6*k+2)
2 = 0
k belongs to the empty set
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