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)
10/9 = 3/z // - 3/z
10/9-(3/z) = 0
10/9-3*z^-1 = 0
-3*z^-1 = -10/9 // : -3
z^-1 = 10/27
-1 < 0
1/(z^1) = 10/27 // * z^1
1 = 10/27*z^1 // : 10/27
27/10 = z^1
z = 27/10
z = 27/10
| 4x-12x-3=85 | | 3/8•1/2 | | Y=1whenx=1/5 | | 45=-16t^2+80t+45 | | 2xy=2x+2y | | -2(18-3y)=(7y+2) | | -4(7x-6)+9=2.3 | | (x-3/4)=-2 | | -197/2-401/4=x | | x+1(x+1)=2(x+1) | | 7/15x=6 | | 9t=-21+30t | | 5z+4y=4 | | 20/538 | | 4m^3+28m^2-72m=0 | | x^4+x^3-6x^2-x+6=0 | | n/24=-30 | | 1.2m-12cm=m | | 7+12x=-6 | | 2x+5=2(4.5x+5) | | X-31=5x+1 | | 200=20x+10 | | 9=3400t+600 | | 7.3y-6.18=-51.9 | | 4X-5=59 | | -7=-5y+4(-y+9)-7+3y | | g-2/2=7/2 | | 6(x-9)=3(x+45) | | -14=v/3-5 | | -8-3+2=-t-6 | | Max+2nx=p | | R^2=15r |