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)^2 = 0
(-x)^2 = 0
(-x)^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^3)/((-x)^2) = 0
x = 0
x in { 0}
x belongs to the empty set
| 4x-13=3x+10 | | (x+4)(x^2+5x-6)= | | 3e*3e+5e= | | 4x^2*7x^5= | | 0=-9-a | | log(x)-log(x-6)=1 | | -15+c=-23 | | 0=-9+v | | 7=n+17 | | 5=m-12 | | 19+x=26 | | 2=5-x | | -27=-15-x | | 5/6=(z-7)/18 | | m+15=3 | | -14=v+5 | | f(7)=10-2x | | -18=-17+v | | -8+n=7 | | -16=-13-k | | 8=7+w | | x+0.83333333=2x-0.83333333 | | 15-b=33 | | 2x^2-12x+10=10 | | 20=10+p | | 6x+5=2-1 | | 4x+0.83333333=5x-0.83333333 | | 36m+14=54 | | 7-0.06666667x=0.05x | | 0.3x+0.4=0.06666667 | | x^2+4x+a=(x-1)(x+b) | | 15=p-4 |