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)
20/150 = 240/z // - 240/z
20/150-(240/z) = 0
20/150-240*z^-1 = 0
-240*z^-1 = -2/15 // : -240
z^-1 = 1/1800
-1 < 0
1/(z^1) = 1/1800 // * z^1
1 = 1/1800*z^1 // : 1/1800
1800 = z^1
z = 1800
z = 1800
| 13+8ln(x)=8 | | 4x+-7-2x=1 | | 3/45=11/e | | 3/45=11e | | (2x-6)*(x)=36 | | -6s-6+7=-4-s | | 10p=-2w-12 | | u(u-6)(u-3)= | | 4.5=0.36+f | | 13/20=60/a | | 6ln(3x+6)=16 | | [8+3(14-6)-18]= | | 7/8-(-3/16) | | 200=-3x^2 | | 12v^2-36v+15=0 | | -26.5+9t=8t | | 9x-45y=6 | | 50/14=7500/f | | -2-9c=-10-10c | | 10/3/5 | | 39/2=429/h | | f(x)=(x^3)-4 | | 6-2b=-b | | (2a+1)(2a-1)= | | 2/x=25/75 | | X=144+x-10 | | x/2=x-4/30 | | 48/1=300/y | | 40-8a=7(-2-5a) | | -z+9=-7z-9 | | x/9=3/10 | | 6/45=10/l |