If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
400/1 = 1.5/x // - 1.5/x
400/1-(1.5/x) = 0
400-1.5*x^-1 = 0
-1.5*x^-1 = -400 // : -1.5
x^-1 = 266.66666667
-1 < 0
1/(x^1) = 266.66666667 // * x^1
1 = 266.66666667*x^1 // : 266.66666667
0.00375 = x^1
x = 0.00375
x = 0.00375
| 3x+26=-7(x-8) | | .80timesx=750 | | 1/2-3/4/3/8-2= | | 5(5-1.5x)=-2x+3 | | .80timesx=600 | | 9t+3t=7-5 | | x^2+5=11x | | .80timesx=525 | | x^2+(x-7)(x-7)=169 | | h/2-5=3 | | 103=-7(1+3r)-r | | .80timesx=550 | | 4x+2y+4=-4+8y-x | | 6=2z+4 | | .80timesx=500 | | 6x3/=326 | | 6x3/=360 | | x*3=3.2*4 | | (D^4+6D^3+9D^2)y=0 | | (D^4+6D^3-9D^2)y=0 | | X-500=2x/3 | | 18-3f=2f | | 195b^2+52b^5c^2-26b^2= | | az+bz=13 | | X-1=9-1 | | 5y^2+22-15=0 | | 11.3-.6x=11.3 | | 195b^6+52b^5c^2-26b^2= | | 4t^2+19t-28=0 | | 16c^6+28b^4c^4-44b^3= | | 12t(t^2+3t-5)=0 | | 8y=9y-15 |