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)
10-(12*x)-(12/x) = 0
10-12*x-12*x^-1 = 0
10*x^0-12*x^1-12*x^-1 = 0
(10*x^1-12*x^2-12*x^0)/(x^1) = 0 // * x^2
x^1*(10*x^1-12*x^2-12*x^0) = 0
x^1
10*x-12*x^2-12 = 0
10*x-12*x^2-12 = 0
DELTA = 10^2-(-12*(-12)*4)
DELTA = -476
DELTA < 0
x in { }
x belongs to the empty set
| 0.06/106 | | 7x-x(2x-7)-16=y | | 106/0.06 | | 24x^2+10x^3-4x^2= | | -5-5/-1(-1) | | -14=y/-9 | | -0.4x=0.17142857 | | (y^2+yx)dx-xdy=0 | | 7.3(x+.3)=2x | | 36x^2-11xy^2-12y^4=0 | | 5x-3=9+4x | | (a^3-2a^2+7)-(2a^2+a-7)= | | 25x+0.45=40y+0.25 | | 10=10(k+9) | | 7x-1=10+10 | | 7x+5+x+3=90 | | -0.4+y=-.75 | | 3x+4+x+6=90 | | f(x)=x+8cosx | | 3s^2+17st+10t^2=0 | | 2X+Y+5Z=50 | | 3x+2=4+3x | | 7x+14-9x=16-13x+11x-2 | | v=xzd | | 5/3n=12 | | 6x-4=4x+28 | | 4z^3+25z=20z^2 | | 4z^2+25z=20z^2 | | 4/2-9 | | y=32+1.4x | | 6s^2+13st-5t^2=0 | | -5/4x=25/4 |