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/x-3 = x/9-(3*x) // - x/9-(3*x)
3*x-(x/9)+1/x-3 = 0
26/9*x^1+1*x^-1-3*x^0 = 0
(26/9*x^2-3*x^1+1*x^0)/(x^1) = 0 // * x^2
x^1*(26/9*x^2-3*x^1+1*x^0) = 0
x^1
(26/9)*x^2-3*x+1 = 0
(26/9)*x^2-3*x+1 = 0
DELTA = (-3)^2-(1*4*(26/9))
DELTA = -23/9
DELTA < 0
x in { }
x belongs to the empty set
| 15=y/2 | | 2x+14.4=723.6 | | 12x-99=y | | 3x^2+72=0 | | 4X+8=2X+42 | | 3d+5.7=1.8d+12.78 | | 10a^2-6a^3=0 | | 55=(x^2-x)/2 | | 2y^2-y+5= | | 142+80= | | 2x+7.9=722.1 | | 14/3=-7/b | | 4(a-2)-5=19 | | 48=-16x^2+8x+96 | | 3w/7=9 | | 14*p+15=42*p-5 | | 6/m=-4 | | 3a+11=-32+15a | | 3*3/4-1/2 | | 2/c=7 | | 8x^0=0 | | -7/10+4/10 | | -y+10=26 | | 31=10+2w | | 4(x+2)=5x+4x+3x | | -3x-8(x+8)=-5(2x+5) | | 3(50m)=1000 | | 5x/3+21=33 | | 142+10t=48+10t | | 7254ft^2=93ft | | y=a+b+c/7 | | 4a-7=9a-3 |