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)
20/x = 4/13 // - 4/13
20/x-(4/13) = 0
20/x-4/13 = 0
20*x^-1 = 4/13 // : 20
x^-1 = 1/65
-1 < 0
1/(x^1) = 1/65 // * x^1
1 = 1/65*x^1 // : 1/65
65 = x^1
x = 65
x = 65
| 2x^2+14x-4=-x+3 | | Log(x/0.02) | | -.25(x-8)=y-5 | | y-5=-.25(x-8) | | 4x^2-44+120= | | 3x^6/-x^6 | | 84.4/x=.006 | | 2t^3(t-t^2+6t^3)= | | 9a-8b-8a-7b= | | 2t^3(t^2+6t^4)= | | x^4=37.2/6.5 | | 0=4x^2+9x-7 | | X^2+8X-280=0 | | -4/3c-7/6=-7/2-2c= | | 2x/3=60 | | T=2r-25 | | (3)*6t^2(t+1)= | | 12-3x-15=2x-78 | | (4+z)(4z-7)=0 | | (x-5)(x^2-7x+3)= | | -11x+9+11x= | | 2x+18=6-x | | 3y=-5+6x | | X/106 | | 32y^5-243y=0 | | 5x-7=-3x-4-9+2x | | (4z-2)(5+z)=0 | | 30x^2-60x^3=0 | | (4z-2)(5z)=0 | | 10000X=90000 | | 1+2-1= | | 24x^2-23x+15=0 |