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)
4/(x^2)+1 = 0
4*x^-2 = -1 // : 4
x^-2 = -1/4
-2 < 0
1/(x^2) = -1/4 // * x^2
1 = -1/4*x^2 // : -1/4
-4 = x^2
x belongs to the empty set
| (x^2+5x+9)(x^2+14x+45)=-39 | | 1-x/4=x-4/9 | | (2x+5)(2-x)=0 | | 4x^4+8x^3-8x-3=0 | | 12x-5y=17 | | (x+y)=0 | | 2x+1/6x^2+x-1 | | 0.03*x=60 | | 0.05*x=60 | | 6-3a=5a-26 | | 3x+6=10x+5 | | log(x^2-4x+5)=0 | | -10x*7=4 | | 2x-3=3x-5 | | -10x^7=4 | | 2*x^2=3 | | 10x^7=4 | | x-10*7=4 | | 7[x-10]=21 | | 2x^2-4x-6=2 | | 6(1+3x)=6 | | 7[x-10]=2 | | 4Q(3P+Q+5)= | | 15-2x=-1 | | 5[3x-9]=30 | | x+(-2.5)+6.5=0 | | -7-5(t-3)= | | 2y+15-4y=k | | 2[x+3]=24 | | 5(2x+6)=-40 | | 2.4x+3.6=-4x-54 | | 10=4x+2x-2x |