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)
4139/x = 260/800 // - 260/800
4139/x-(260/800) = 0
4139/x-13/40 = 0
4139*x^-1 = 13/40 // : 4139
x^-1 = 13/165560
-1 < 0
1/(x^1) = 13/165560 // * x^1
1 = 13/165560*x^1 // : 13/165560
165560/13 = x^1
x = 165560/13
x = 165560/13
| 121^1/2 | | 0.5t+4=3 | | ln(8x+5)-ln(4x)=8 | | 75m=12 | | 30x-4=x+18is | | 450+0.04x=200+0.16x | | 50x=75+65x | | (18+x)4=732 | | 24/x=6 | | (p-1/11)(p- | | 6lnx-12lny= | | 1/3=x/6 | | 0.4m=12 | | 12y^2-144=48 | | 1/3=c/12 | | 2(8-11)=m-3 | | 1/5=b/15 | | -1.5+-2.5= | | -5y+6=8y-20 | | N/64=19/8 | | x=3e-5 | | 6w+5=-2(3w-7)-9 | | 1/2=z/12 | | 4r+6=4 | | 9c-6=282 | | 1/4=y/8 | | 19-14=3*1 | | 5n-3=-238 | | 12x+7-3x=2x-10 | | -5q=-20 | | 2(8-11)=-3 | | 2/3x-1=2/7 |