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)
400/2400 = 60/x // - 60/x
400/2400-(60/x) = 0
400/2400-60*x^-1 = 0
-60*x^-1 = -1/6 // : -60
x^-1 = 1/360
-1 < 0
1/(x^1) = 1/360 // * x^1
1 = 1/360*x^1 // : 1/360
360 = x^1
x = 360
x = 360
| 0.2+1.2x=-0.2+0.8x | | -6x+7y=8 | | 2x(x-3)=-4 | | 3+4i+3-4i= | | 5/4z-10=-5/4(8-z) | | 0.0055x^2-0.185x+3.611=0 | | 4.27*3-0.04*0.04= | | -9(v-1)=-4v-26 | | 3/7=1440/x | | 3x^3-5x^2-24x+40= | | x^2+15x+56.25=-26+56.25 | | =1-3y | | 4027*3-0.04*0.04= | | 2/3/8/7 | | 10/15=x/18 | | x-7/10=-1/5 | | 8/5=n/650 | | .003x^2-.450x+16.9=0 | | n-36=-14 | | 315/21=540/n | | 21/113=5/n | | 0.003x^2-.450x+16.900=0 | | 3w^2-19w-14=0 | | 2=v/25.6 | | (2-5i)-(8+6i)= | | 8/3x+102/2=6 | | 12z^2-5z-2=0 | | 2x(5+4)3x(5*6)= | | 5/855=41/n | | y^3+5y-4y-20= | | 2x^3-2x-x^2+1=0 | | 2x-3x+1=0 |