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-(1/(x^2)) = 0
X-x^-2 = 0
-1*x^-2 = -X // : -1
x^-2 = X
-2 < 0
1/(x^2) = X // * x^2
1 = X*x^2 // : X
1/X = x^2
x^2 = 1/X // ^ 1/2
abs(x) = 1/(X^(1/2))
x = 1/(X^(1/2)) or x = -(1/(X^(1/2)))
x in { 1/(X^(1/2)), -(1/(X^(1/2))) }
| X-(1/x^2)=9 | | 20x-23=14x-13 | | 8x+2-3x+1= | | 8x-1-6x-9= | | 5x+7y-2z=16 | | 5x-7y+2z=16 | | 1.5=(4-x)/(3-x) | | sqrt(2.52)=(4-x)/(3-x) | | 13c/5d^3c | | 4x+8=3(x-4)+5 | | 9x-5=8(x-8)-3 | | 2(4x+28)=32 | | 5x-9=4(x+9)+10 | | 4(6x+30)=72 | | 11(x-8)-10=15x-138 | | 4x^3-5x^2+3x-14=0 | | 4x^3-5x^2-3x-14=0 | | 7(x+2)-4=3x+4(3+x) | | r^2=0.9897 | | 5(8x-5)=185 | | y=0x^2 | | x^2=6/17 | | 5.2=x+0.84x | | -1/2(8x-2)=4 | | 3(x-4)-8=15x-152 | | 22=10x-38 | | x/-9=-2-(-11) | | y=abs(2-ln(abs(x-2))) | | Y=1/5tb | | 20-2/3n=12 | | F(7)=4x+8 | | f(x)=2x^2-20x+54 |