If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( x )
((1/4)*x)^2 = 0
((1/4)*x)^2 = 0
((1/4)*x)^2 = 0
1/16*x^2 = 0 // : 1/16
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
-(8/(((1/4)*x)^2))-1 = 0
-8*((1/4)*x)^-2-1 = 0
-128*x^-2 = 1 // : -128
x^-2 = -1/128
-2 < 0
1/(x^2) = -1/128 // * x^2
1 = -1/128*x^2 // : -1/128
-128 = x^2
x belongs to the empty set
| M^2+5m=24 | | 3x-7x-11+8y-13y= | | 7x+6i=-14+(24y)i | | x/9+14=20 | | n^2+2n-1=0 | | -2x+3y=21 | | 64c^2-25f^2=0 | | x+3/2x=10 | | 7x-8=43 | | 0x+8=5x-3 | | 400+1100x-100x^2=3200 | | 25c^2+40cg+16g^2=0 | | x=-5/-3 | | 3=5(x-6)-3x | | 16c^2-40c+25=0 | | 149-2x=25x+20 | | 0.66+2=0.33(4a+1) | | 4t-3=9 | | 2x+777777777766=778x+74772277181 | | 5-3(2+9x)=26 | | 9.99x+11.50y=10.90 | | y=-4-1+5 | | -3x=2-7 | | x+2x+13=117 | | 4(n-3)=22 | | 984x=2223321x | | x/9+8=12 | | b/5+6=13 | | 4.5x=-8.20 | | 0.5x=4.5+y | | 4x-x+21x=5 | | 2x*4=7x-7/6 |