If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
(4/3)*z+5/z = 0
4/3*z^1+5*z^-1 = 0
(4/3*z^2+5*z^0)/(z^1) = 0 // * z^2
z^1*(4/3*z^2+5*z^0) = 0
z^1
(4/3)*z^2+5 = 0
(4/3)*z^2+5 = 0
DELTA = 0^2-(4*5*(4/3))
DELTA = -80/3
DELTA < 0
z in { }
z belongs to the empty set
| 3n+2=5n-4 | | 31=5f+3f | | 7x+7+4y=113 | | 5m+34=-2(1-7n) | | 5(2n-3)=205 | | 89-(4x+14)=4(x+3)+x | | 2x+3x-6=9 | | -(1/5)+(5/5)=-(4/5) | | 4*9-6/15=x | | 696969+69696969= | | 150=2x+(y+3) | | 4*9-6/15 | | 3(-2x+1)=15 | | 8-2X=(x-2) | | -6x-(-11x)-14x+7x+(-16)=6 | | 1+x=-7 | | b=(25+7) | | 25x-8-15x+2=25x-4-15x+11 | | -4(-5u+4)-8u=2(u-7)-8 | | 64+72= | | 2w+1/6+9w-5/2=46 | | 2(7x+5)=4x | | 3/2*4/9 | | 12=7w+3/2-9w-8/8 | | b=55+24w | | 9x+8-8x=14 | | b=55+(15+9)w | | 3+x-13+4-6x=12 | | -14x+2=-12x-4 | | 30/6=5*x | | 3/8=12/x | | b-2+8b=23 |