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)
18/z = 9/12 // - 9/12
18/z-(9/12) = 0
18/z-3/4 = 0
18*z^-1 = 3/4 // : 18
z^-1 = 1/24
-1 < 0
1/(z^1) = 1/24 // * z^1
1 = 1/24*z^1 // : 1/24
24 = z^1
z = 24
z = 24
| (4x)4-36=0 | | 8t-2=-3+7t | | 50b+.50=125 | | c=5/9*(f-32) | | 12l=276 | | 6(2x-4)=2(6x+9) | | 5x+4=-x+22 | | x^4-7x^2+20x+12=0 | | 7+11t-5=6t+9-2t | | z^2-9z=72-8z | | z^2-4z=-24+6z | | 3(3+5x)-3=66 | | 1/2(x+5)=2/3(2x-10) | | x+(x+31)+(4x-40)=603 | | t^2+8t=24+3t | | z/15=-13 | | t^2-2t=6-3t | | |x-1-3-x|=2 | | x-1-3-x=2 | | (x-4)(4x-3)=0 | | 2/7x=63 | | 7.5+0.5x=7.5 | | x/9=12/10 | | 11-10x=19-17x | | x+2/7x=63 | | 30=-5/2y | | 7x^3+2x+9-6=0 | | h=40-5t-5t^2 | | 18/14 | | 5.4q-3.5-5.2q=-0.8q-4.5 | | 0.5v=-9 | | -0.5=-9 |