If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( k )
k^3 = 0
k^3 = 0
k^3 = 0
1*k^3 = 0 // : 1
k^3 = 0
k = 0
k in (-oo:0) U (0:+oo)
((k^6)/(k^3))^3 = 0
1*k^9 = 0 // : 1
k^9 = 0
k = 0
k in { 0}
k belongs to the empty set
| -6x+6=-2x-18 | | X+2=-.25x+5 | | 3(3x-1)=15 | | 1x=1x+5 | | 1=x/5 | | 30+11Q=300-7q | | 5(4+j)=75 | | x^3+4x-2x-8=0 | | r/-3=-14 | | 13-5x=7x+4x | | -6(-7x+9)=-264 | | 4x-5/2x | | (4c^3/3c^1)3 | | 3x-7=-3x-49 | | 3(w+2)=2(w-7) | | -23=x-30 | | 12n+n= | | 85-44= | | 28+57= | | y=x^3-9x^2-15x+3 | | 0.2(2-4x)=4-2x | | (5+2i)-(23-8i)=0 | | 9(m-1)=36 | | -10+r=14 | | -r-2=-r-1 | | f(x)=-7x^2+2x+6 | | D=.25fk | | 300+7q=30+11Q | | 674821x+364578= | | 2ln(x+1)=0 | | u/5=-15 | | 4x^2+3x=-7x |