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^2-1 = 0
x^2-1 = 0
x^2-1 = 0
1*x^2 = 1 // : 1
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
x in (-oo:-1) U (-1:1) U (1:+oo)
1/(x^2-1) = 0
x belongs to the empty set
| 1.2=6.5/x | | 2x+y+2=3x+10 | | -21/7 | | 15x^2-34+15=0 | | 3x-10(x+2)=26-7x | | 17-8x=3x+16 | | 20-x/x-17=5/3 | | 3x-2+2x+5=90 | | 7*-119/3/3 | | (2x^3/3y^2)3 | | 50x+75y=575 | | 3y+5x=x+9 | | 4x^3+30x^2+36x= | | f(2)=x^2+2x-1 | | 10y^4+2y^2= | | X/-6+8=12 | | 6(-7d+9)-2= | | 5-3z=2 | | 9(x-4)=9-33 | | -2(3x-3)=4x-9 | | 2-4x=-6 | | 4n-24m= | | 225x+4=0 | | ln(x-1)-ln(2x+3)=1 | | f(x)=6x^2-7x+18 | | 7-3d=-18 | | 12+4m=-9 | | 45=6x-3 | | 9-2p=16 | | lx(x-1)-ln(2x+3)=1 | | 34=2x+3x+9 | | 4x+1.5y=6 |