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)
1/3 = 3/x // - 3/x
1/3-(3/x) = 0
1/3-3*x^-1 = 0
-3*x^-1 = -1/3 // : -3
x^-1 = 1/9
-1 < 0
1/(x^1) = 1/9 // * x^1
1 = 1/9*x^1 // : 1/9
9 = x^1
x = 9
x = 9
| 3k=8.1 | | -9x^2-1=10x^2 | | 13n-6=86 | | 2y-(b-16)x=19 | | x^4+10x^2-14=0 | | x-5p=v | | 5-9x=-12 | | 8(3x-5)+6x=-6x | | 5h+2th=22 | | x=9x-48 | | 2(3+2x)=60 | | G-7=2.4 | | 10a+2=52 | | 10y^3+10y^2+3y+3=0 | | 7h+1=-41 | | 15-3k=10(k) | | 9a+6.4+5.6=29 | | 6+2(2w+2)=30 | | 8=7-4+3r | | 2x^(-1/3)=10 | | 3x-21=16 | | 8z-z^2=25 | | 4x-68=84 | | 2x(-1/3)=10 | | 20n+4=200 | | 21x^2-40x+16=0 | | 15+5*m=415 | | Y/5.5=30 | | 18.32=c+5.9 | | 78/38 | | -3x=36+6y | | 5x^2+8x-5x-8=0 |